3827 results about "Photoelectric conversion efficiency" patented technology

The embodiment of the invention relates to the photovoltaic field, and provides a main-grid-free back contact battery and a photovoltaic module, and the main-grid-free back contact battery comprises a battery substrate which is provided with a first welding region and a second welding region which are alternately arranged along a first direction, two edge regions which are opposite along a second direction, and a central region located between the two edge regions; the first fine grid and the second fine grid are positioned on the battery substrate and are alternately arranged along a second direction; the bonding pads are located in the edge area, and each bonding pad is at least in contact connection with two adjacent homopolar fine grids; the welding spots are located in the central area, each welding spot is in contact connection with each same-polarity fine grid, and M same-polarity fine grids are arranged between the bonding pads and the welding spots which are adjacent in the second direction; the connecting line is in contact connection with the bonding pad and is also in contact connection with at least one welding spot close to the bonding pad along the second direction; the welding area is a first welding area and the same-polarity fine grid is a first fine grid, and / or the welding area is a second welding area and the same-polarity fine grid is a second fine grid, so that the photoelectric conversion efficiency of the main-grid-free back contact battery is at least improved.

The invention relates to a backside illuminated image sensor, a preparation method thereof and electronic equipment. The backside illuminated image sensor comprises a substrate, a grating, photodiodes and target isolation structures, wherein the photodiodes and the target isolation structures are located on the first surface of the substrate, are alternately arranged in the first direction parallel to the first surface and extend towards the substrate; the substrate internally comprises a plurality of trench isolation structures which extend into the substrate through the first surface and are arranged at intervals in the first direction; the trench isolation structures and the target isolation structures over the trench isolation structures are arranged in a one-to-one manner; the photodiode comprises a SiAs laminated layer and a SiAs cover layer which are arranged along a direction away from the substrate, and a SiP layer which penetrates through the SiAs laminated layer along a first direction and a direction towards the substrate; the target isolation structure comprises a protruding part higher than the top surface of the photodiode; the grating and the protruding parts are prepared in the same process step at the same period. Signal crosstalk of the BSI image sensor and unnecessary damage caused by IMP can be avoided, and photoelectric conversion efficiency can be improved.

The invention belongs to the technical field of perovskite solar cells, and particularly discloses a self-assembly monomolecular film hole transport material based on diphosphoric acid and a preparation method and application thereof.The diphosphoric acid serves as an anchoring group, the chelation between the material and a conductive base can be effectively enhanced, the self-assembly characteristic of the material on the surface of a substrate is improved, and the hole transport efficiency is improved. The compact and smooth self-assembled monomolecular film is formed. Meanwhile, the electron and space effects of alkyl chains or benzene ring connecting units are regulated and controlled, so that the molecular stereo configuration and energy level matching are optimized. The material disclosed by the invention is simple in synthesis steps and low in preparation cost, and industrial synthesis of the material can be realized. When the material is applied to an inverted perovskite solar cell as a hole transport layer, photoelectric conversion efficiency exceeding 24.7% and excellent device stability performance can be obtained, and huge commercial prospects are shown.

The invention discloses a solar cell and a photovoltaic module. Wherein the semiconductor substrate comprises a first surface and a second surface which are opposite to each other, and a side surface connected with the first surface and the second surface; in the direction from the first face to the second face, the side face comprises a first area and a second area which are sequentially arranged, the first area is provided with a first texture structure, and the second area is provided with a second texture structure. The first texture structure and the second texture structure can enable light incident to the side face to be reflected and refracted for multiple times, the advancing direction of the incident light on the side face of the semiconductor substrate is changed, the optical path is prolonged, the light trapping effect is generated, and generation of photon-generated carriers is increased, so that when the side face of the semiconductor substrate is provided with the first texture structure and the second texture structure, the light trapping effect is improved. More light rays can be absorbed and utilized by the side surface of the semiconductor substrate, and the photoelectric conversion efficiency of the solar cell can be improved.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact cell and a manufacturing method thereof, and a photovoltaic module, and the back contact cell comprises a first doped region and a second doped region which are located on a substrate and are spaced from each other; the passivation layer is located on the sides, away from the substrate, of the first and second doped regions; the first main grids and the second main grids are alternately arranged in the first direction, the first fine grids and the second fine grids are alternately arranged in the second direction, the first main grids and the fine grids are right opposite to the first doped region, and the second main grids and the fine grids are right opposite to the second doped region; at least part of the main grids comprise non-contact parts and at least one contact part in contact connection with the non-contact parts, the contact parts penetrate through the passivation layer and are in contact connection with the doped region, and each contact part is at least located in a gap between two adjacent same-polarity fine grids; and the main grid is the first main grid, the doped region is the first doped region and the same-polarity fine grid is the first fine grid, and / or the main grid is the second main grid, the doped region is the second doped region and the same-polarity fine grid is the second fine grid, so that the photoelectric conversion efficiency of the cell is improved.

The present invention discloses a self-assembled monolayer hole transport material based on an alkyl polyphosphate anchoring group, a synthesis method thereof, and an application in an inverted perovskite solar cell. The present invention uses carbazole or 3,6-diphenylcarbazole with good hole transport properties as a parent core, and achieves complete coverage and stable self-assembly of the material on the substrate surface by improving the anchoring group from traditional alkyl monophosphate to alkyl diphosphate and triphosphate. The synthesis method of the present invention is simple and the synthesis cost is low. The prepared material can achieve the dual functions of hole transport and perovskite interface passivation, while enhancing the self-assembly strength and stability. When the material is used as a hole transport layer in an inverted perovskite solar cell, a photoelectric conversion efficiency of >20% can be obtained without doping, and the material has broad application prospects.

The invention discloses a self-assembled monomolecular layer hole transport material, a hole transport layer and a battery thereof. According to the present invention, the compound having different anchoring groups and represented by the formula (I) can be subjected to firm self-assembly with the substrate surface through the chemical bonding manner, such that the good coverage rate is provided, the film forming quality is increased, and the transmission performance is improved; and meanwhile, the material has a rigid conjugate large-plane condensed ring core structure, so that the hole transmission performance of the material is ensured, and the photovoltaic performance is favorably improved. When the material is applied to a perovskite solar cell to prepare a hole transport layer, the hole extraction capability can be enhanced, and the open-circuit voltage, the filling factor and the photoelectric conversion efficiency of a device can be improved.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact battery and a preparation method thereof, and a photovoltaic module, and the back contact battery comprises a battery body of which the back surface comprises a first edge region, a central region and a second edge region which are sequentially arranged along a first direction; the first fine grid and the second fine grid are positioned in the central region and are alternately arranged along a second direction; the edge bus bar extends along the second direction, is positioned in the first edge region or the second edge region, and is connected with the plurality of first or second fine grids; the edge bonding pad is located on the portion, close to the first edge area or the second edge area, of at least one fine grid and electrically connected with the edge bus bar, and the fine grid is one of the first fine grid and the second fine grid; one end of the connecting section is connected with one side, close to the edge bus bar, of the edge bonding pad or connected with one of the two opposite sides of the edge bonding pad in the second direction, the other end of the connecting section is connected with the edge bonding pad or one fine grid, and at least the photoelectric conversion efficiency of the back contact battery can be improved.

This invention discloses a fluorene-based organic small molecule hole transport material and its applications. The general structural formula of the fluorene-based organic small molecule hole transport material is as follows: where n = 1-4, and R represents the hole transport capacity. This fluorene-based organic small molecule hole transport material is used as an undoped hole transport material in perovskite solar cell devices. By introducing dicarboxylic acid groups onto the fluorene-based organic small molecule hole transport material, when used in an inverted perovskite solar cell device, it can form chemical bonds with the hydroxyl groups of the glass conductive substrate, forming a directionally aligned self-assembled layer on the surface of the glass conductive substrate. This effectively improves the charge transport capability at the interface and increases the photoelectric conversion efficiency of the perovskite solar cell device. Furthermore, since this perovskite solar cell device does not contain lithium salts, it exhibits high water and oxygen stability. In addition, the synthesis process of this fluorene-based organic small molecule hole transport material is simple, and the raw materials are inexpensive and readily available, making it highly valuable for practical applications.

The invention relates to a solar cell and a manufacturing method thereof. The solar cell comprises a substrate, a first electrode and a second electrode, the front surface of the substrate comprises a first metallization region and a first non-metallization region, the first metallization region is provided with a first pyramid structure, the first non-metallization region is provided with a second pyramid structure, the spire of the first pyramid structure is higher than that of the second pyramid structure, and the first metallization region is provided with a first diffusion doping region; the back surface of the substrate comprises a second metallization region and a second non-metallization region, a tunneling layer and a semiconductor doping layer are sequentially laminated on one side, far away from the substrate, of the second metallization region, and the second non-metallization region is provided with a third pyramid structure; the first electrode is arranged in the first metallization region, and the first electrode is electrically connected with the first diffusion doping region; and the second electrode is arranged in the second metallization region and is electrically connected with the semiconductor doping layer. The short-circuit current output and the overall photoelectric conversion efficiency of the cell are improved, and the double-sided rate of the cell is improved.

The invention provides a solar cell, which comprises a silicon substrate having a backlight surface and a light facing surface which are opposite, the backlight surface comprises first areas and second areas which are alternately arranged, the first areas of the backlight surface are provided with first pyramid structures, the light facing surface is provided with second pyramid structures, the first pyramid structures are provided with first passivation contact layers, and the second pyramid structures are provided with second passivation contact layers; the first pyramid structure is provided with a first passivation contact layer, the reflectivity of the first area is 5%-14%, the second pyramid structure is provided with a passivation antireflection layer, the reflectivity of the light facing face is 5%-14%, the second area is provided with a second passivation contact layer, the reflectivity of the second area is 25%-50%, and the ratio of the area of the first area to the total area of the backlight face is 40%-70%. The light trapping effect of the light-facing surface is further improved by setting different shapes in different areas of the light-facing surface and the backlight surface, and the passivation effect and the carrier transport effect of the surface of the back pyramid structure are balanced while the light trapping effect of the backlight surface is improved; the photoelectric conversion efficiency and the double-sided rate of the solar cell are improved; and the appearance color difference of the receiving surface is improved.

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic cell and a manufacturing method thereof, and a photovoltaic module, the photovoltaic cell comprises a substrate, the substrate is provided with a first surface and a second surface which are opposite, and the first surface is provided with first areas and second areas which are alternately arranged along a first direction; the substrate in the second area comprises a bottom surface which is recessed towards the interior of the substrate and a slope which is connected with the bottom surface and the first area, the slope inclines towards the first area, and the bottom surface and the slope define a groove; the bottom surface is a first suede comprising a plurality of first pyramids, the slope is a second suede comprising a plurality of second pyramids, an included angle formed by spire of the first pyramids is smaller than an included angle formed by spire of the second pyramids, and the height of the first pyramids is smaller than that of the second pyramids. The embodiment of the invention is at least beneficial to improving the absorption and utilization rate of the second region on light, so as to improve the photoelectric conversion efficiency of the photovoltaic cell.

The invention discloses a solar cell and a manufacturing method thereof, and a photovoltaic module, and relates to the field of photovoltaic technology. The solar cell includes: a semiconductor substrate having a first surface including a first region and a second region adjacent to a first cut side; the second region comprises a step structure, an included angle is formed between the side wall of the step structure and the thickness direction of the semiconductor substrate, the first region is provided with a first pyramid structure, and the bottom wall of the step structure is provided with a first texture structure or a second pyramid structure; the first doping layer is arranged on the first region, and the height of the bottom wall of the step structure is lower than that of the first doping layer; the first passivation layer is arranged on one side, deviating from the semiconductor substrate, of the first doping layer and is arranged on the second region; the second passivation layer is arranged on the edge, close to the second area, of the first area, part of the second area and the first cutting side face. The passivation effect near the cutting side face is improved, carrier recombination is reduced, and the photoelectric conversion efficiency is improved.

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic cell and a manufacturing method thereof, and a photovoltaic module, the photovoltaic cell comprises a substrate, the substrate comprises a first surface and a second surface which are oppositely arranged, the first surface comprises non-metal regions and metal regions which are alternately arranged along a first direction, the non-metal regions are first suede surfaces, and the metal regions are second suede surfaces; the first suede comprises a plurality of first pyramids with rough surfaces; the first pyramid comprises a main body part and at least two wrapping parts which are located on the side face of the main body part and connected in the direction perpendicular to the side face. Wherein the main body part is a pyramid-like pyramid with a plurality of side edges, the side surfaces are connected with the adjacent side edges, and the main body part further comprises a bottom surface connected with the plurality of side surfaces; the wrapping part extends towards the direction close to the bottom face in the second direction, one end, away from the bottom face, of the wrapping part comprises a protruding block, the protruding block is in a protruding shape relative to the bottom face, and the second direction is the extending direction of the side edges, so that the reflectivity of the non-metal area to light is at least reduced, and the photoelectric conversion efficiency of the photovoltaic cell is improved.

The invention discloses a floating type photovoltaic platform device capable of actively adjusting the angle of a photovoltaic module, which comprises floating bodies, a photovoltaic mechanism, a central control system, connecting floating bodies and gravity anchors, and is characterized in that the photovoltaic mechanism is mounted on the floating bodies, the floating bodies are connected with the gravity anchors, the gravity anchors are placed in a water area, the plurality of floating bodies are connected through the connecting floating bodies, and the central control system is connected with the central control system. The central control system is installed on the connecting floating body, the central control system is respectively connected with the floating body and the photovoltaic mechanism, the floating body comprises an adjusting air cushion and a supporting floating body, the adjusting air cushion is arranged on the supporting floating body, the photovoltaic mechanism is arranged on the adjusting air cushion, and the supporting floating body is respectively connected with the connecting floating body and the gravity anchor. The sun position and the illumination intensity are monitored in real time through the central control system, the angle of the photovoltaic mechanism is actively adjusted through the adjusting air cushion, it is ensured that the photovoltaic assembly can receive sunlight at the optimal angle all the time, and therefore the photoelectric conversion efficiency is remarkably improved.

The invention relates to the field of photovoltaic technology, in particular to a solar cell, a photovoltaic module and a preparation method of the solar cell, the solar cell comprises a substrate, the substrate comprises a first surface and a second surface, the first surface comprises a first area and a second area, and the second surface comprises a third area and a fourth area, the first diffusion layer is located on the first area or located in the substrate corresponding to the first area, the first diffusion layer is opposite to the substrate in conductive type, the second diffusion layer is located in the substrate corresponding to the third area, the second diffusion layer is opposite to the first diffusion layer in conductive type, and the first passivation layer is located on the third area and the fourth area. The first passivation layer covers the second diffusion layer and is in contact with the substrate, the first electrode electrically connected with the first diffusion layer is arranged on the first area, the second electrode electrically connected with the second diffusion layer is arranged on the third area, and the open-circuit voltage and the short-circuit current of the solar cell are improved through the design, and the photoelectric conversion efficiency is improved.

The invention discloses a back contact cell and a photovoltaic module, relates to the technical field of photovoltaic, and aims to generate a strong electric field on the front surface of a substrate layer through a first passivation layer, separate majority carriers from minority carriers, reduce the carrier recombination rate on one side of the front surface of the back contact cell and improve the photoelectric conversion efficiency of the back contact cell. And moreover, the dependence on chemical passivation by using hydrogen is reduced, so that the problem of ultraviolet light induced degradation in the existing battery technology is inhibited and even solved. The back contact cell includes a substrate layer, and a first passivation layer disposed on a front surface of the substrate layer. The material of the first passivation layer includes a high work function material or a low work function material. The work function of the high work function material is greater than 4.8 eV; or the work function of the low work function material is less than 4.3 eV. The photovoltaic module comprises a battery string and a packaging layer. The battery string is formed by electrically connecting a plurality of back contact batteries provided in the first aspect and various implementation modes thereof; the encapsulation layer covers the surface of the battery string.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact cell and a manufacturing method thereof, a back contact laminated cell and a photovoltaic module, and the manufacturing method comprises the steps: providing a substrate with a first surface and a second surface which are opposite to each other, and the second surface comprises a first region and a second region which are alternately arranged along a second direction; forming a laminated structure comprising a tunneling layer, a doped polycrystalline silicon layer and a first protection layer which are stacked on the first region; forming an initial second passivation lamination layer which covers the second surface and comprises an intrinsic amorphous silicon film and a doped amorphous silicon film which are stacked; forming a second protection layer on one side, far away from the substrate, of the doped amorphous silicon film; etching the first region by adopting a first laser etching process; and taking the second protection layer on the second region as an etching barrier layer, taking the first protection layer as an etching stop layer, and removing the initial second passivation lamination layer or the second protection layer and the initial second passivation lamination layer remaining on the first region by adopting a first etching solution, thereby at least facilitating the improvement of the photoelectric conversion efficiency of the back contact battery.

The invention relates to ultrahigh-transmittance anti-reflection multifunctional coated photovoltaic glass and a preparation method thereof, and belongs to the technical field of photovoltaic glass, the photovoltaic glass comprises a photovoltaic glass substrate, the photovoltaic glass substrate is provided with a high-transmittance reflective coating, the high-transmittance reflective coating comprises a silicon dioxide layer, a titanium dioxide layer and a nanometer material layer, and the nanometer material layer is arranged on the silicon dioxide layer. The silicon dioxide layer and the titanium dioxide layer are arranged between the photovoltaic glass substrate and the nanometer material. The preparation method comprises the following steps: S1, preparing raw materials; s2, preparing a coating; s3, coating process; s4, performing surface treatment on the nano structure; s5, coating curing and surface treatment; and S6, testing and evaluating the performance. According to the ultrahigh-transmittance anti-reflection multifunctional coated photovoltaic glass, the performance and durability of a photovoltaic cell can be remarkably improved, by arranging the high-transmittance anti-reflection coating, the light transmittance of the photovoltaic glass is improved, the overall photoelectric conversion efficiency can be improved by 5-8%, and light reflection loss is remarkably reduced.

The invention relates to the technical field of photovoltaic, in particular to a back contact photovoltaic module which comprises battery strings and bus bars, each battery string comprises battery pieces and welding strips, the welding strips are connected with the adjacent battery pieces, and the bus bars are connected with the adjacent battery strings; first grid lines with different polarities are arranged on the back surfaces of the battery pieces, the bus bars are arranged on the back surfaces of the battery pieces, the first grid lines extend in the first direction, and the bus bars extend in the second direction; an insulating film is arranged between the bus bar and the first grid line of one polarity, and a conductive film is arranged between the bus bar and the first grid line of the other polarity. In the invention, the bus bar is directly connected with the positive electrode first grid line or the negative electrode first grid line, so that a welding strip does not need to be arranged between the bus bar and the positive electrode first grid line or the negative electrode first grid line, the length of the welding strip can be shortened, the use amount of the welding strip is reduced, and the production cost is reduced. And the bus bar is directly arranged on the back surface of the battery piece, so that the area ratio of the battery piece in the back contact photovoltaic module can be improved, and the photoelectric conversion efficiency is improved.

The invention discloses a self-assembly material, a solar cell and electric equipment, the self-assembly material comprises a first self-assembly molecular material, the structural formula of the first self-assembly molecular material is # imgabs0 #, Ar represents an aryl group, the Ar comprises at least one coordination atom, the coordination atom comprises lone pair electrons which are not bonded, and the first self-assembly molecular material comprises a second self-assembly molecular material, a third self-assembly molecular material and a fourth self-assembly molecular material, the coordination atoms comprise one or more of phosphorus atoms, arsenic atoms, sulfur atoms and selenium atoms; l comprises one or more of a carbon-containing group, a nitrogen-containing group, an oxygen-containing group, a silicon-containing group, a phosphorus-containing group and a sulfur-containing group, and n is 0-10; a comprises a hydrophilic group. When the self-assembly material is used for passivating the light absorption layer of the solar cell, a better passivation effect can be realized, and the photoelectric conversion efficiency and the stability of the solar cell can be improved.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact battery and a manufacturing method thereof, and a photovoltaic module, the back contact battery comprises a substrate, the substrate is provided with a first surface and a second surface which are opposite to each other along a first direction, and the second surface is provided with first regions and second regions which are alternately arranged along a second direction; the first dielectric layer and the first doping layer are stacked on the first region, and P-type doping elements are arranged in the first doping layer; the second dielectric layer and the second doping layer are stacked on the second region, and the second doping layer is provided with N-type doping elements; wherein the first doped layer comprises N layers of stacked first doped films, the crystallization rate of the (N-1) th layer of first doped film is higher than the crystallization rate of the Nth layer of first doped film in the direction away from the substrate, and N is a positive integer greater than or equal to 2. The embodiment of the invention is at least beneficial to improving the photoelectric conversion efficiency of the back contact battery.

The invention is applicable to the field of photovoltaic technology, and provides a solar cell, a cell module and a photovoltaic system.The solar cell comprises a silicon substrate, and a backlight surface of the silicon substrate is provided with a plurality of grooves; the doped region structures are at least arranged at the plurality of grooves, each doped region structure comprises an internal expansion layer arranged in the silicon substrate, and a passivation layer and a first doped layer which are sequentially arranged on the backlight surface of the silicon substrate, and the passivation layer is provided with a plurality of hole structures; for at least part of the grooves, the number of the hole structures at the corresponding positions of the edges of the grooves is larger than that of the hole structures at the corresponding positions of the middles of the grooves. Holes are reduced in the middle of the groove, the passivation effect is improved, and surface recombination of carriers is reduced; and meanwhile, the holes are additionally formed in the edges of the grooves, so that the carrier transmission capability is improved, and carrier transmission recombination is reduced. Therefore, the photoelectric conversion efficiency and the overall performance of the solar cell are improved together.

The invention relates to a back contact solar cell and a preparation method thereof, the back contact solar cell comprises a front surface and a back surface which are oppositely arranged on a semiconductor substrate, and the back surface comprises a first conductive region, a second conductive region and an isolation structure unit, the first conductive regions and the second conductive regions are opposite in conductive type and are alternately arranged in the first direction of the semiconductor substrate, the isolation structure units are located between the first conductive regions and the second conductive regions, and the length of the isolation structure units in the first direction ranges from 20.0 micrometers to 200.0 micrometers. Each isolation structure unit comprises a first isolation region, a second isolation region, a third isolation region, a fourth isolation region and a fifth isolation region which are different in isolation region morphology. According to the isolation structure unit provided by the invention, the good insulation effect is realized, the collection efficiency of current carriers is improved, the passivation performance of the isolation region is improved, meanwhile, the damage to the battery caused by laser grooving can be reduced, and the photoelectric conversion efficiency of the back contact battery is improved.

The invention discloses a method for passivating a perovskite solar cell by using diphenylamine ammonium salt and a derivative thereof, and belongs to the technical field of perovskite solar cells. According to the method, diphenylamine ammonium salt and a derivative thereof are introduced as an interface modification layer of perovskite through a solution spin-coating process, so that in-situ passivation is realized. The diphenylamino ammonium salt and the derivative thereof can effectively reduce surface defects of perovskite, passivate uncoordinated lead ions, supplement iodine vacancies, significantly reduce non-radiative recombination of a perovskite layer and promote charge extraction by virtue of unique properties of the diphenylamino ammonium salt and the derivative thereof, so that the open-circuit voltage and fill factors of the perovskite solar cell are improved. Meanwhile, large-volume ammonium cations can be gathered on a crystal boundary, so that the defect of the crystal boundary is filled, and ion migration is inhibited. In addition, after passivation, moisture can be effectively prevented from invading the three-dimensional perovskite structure, and the humidity stability and the storage stability of a cell device are remarkably improved. The invention aims at improving the photoelectric conversion efficiency of the perovskite solar cell and realizing the long-term stability of the device performance.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact photovoltaic module, which comprises a battery body of which the back surface comprises a plurality of positioning areas which are arranged at intervals along a first direction, and first fine grids and second fine grids which are alternately arranged along a second direction are arranged on the back surface; each interconnection structure is electrically connected with one of the plurality of first fine grids and the plurality of second fine grids; a single interconnection structure electrically connected with the fine grids is used as a target interconnection structure, any fine grid electrically connected with the target interconnection structure comprises a first branch and a second branch, each of the first branch and the second branch comprises an end part close to the target interconnection structure, and the first branch and the second branch are arranged along the direction close to the target interconnection structure. The widths of the end parts of the first branch and the second branch in the second direction are gradually reduced, and the fine grid is one of the first fine grid and the second fine grid; and the insulating strip is positioned on any fine grid which is electrically insulated from the target interconnection structure, and is at least beneficial to improving the photoelectric conversion efficiency of the back contact photovoltaic module.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact battery and a photovoltaic module, and the back contact battery comprises a battery substrate which is provided with a first edge; a first grid line, a second grid line, a first connecting line and a second connecting line, the first connecting line is connected with the first grid line, and the second connecting line is connected with the second grid line; the first connecting line comprises an edge connecting line adjacent to the first edge, and the edge connecting line is not provided with a welding part; the second connecting line comprises a collecting part and a spacing part, and the collecting part is connected with the second grid line; one end of the connecting structure is connected with the edge connecting line, and the other end of the connecting structure penetrates through the interval part and is connected with the first connecting line adjacent to the edge connecting line; the end, adjacent to the connecting structure, of the collecting part serves as a first part, the remaining collecting part serves as a second part, and the width of the first part in the second direction is larger than that of the second part in the second direction. The back contact cell provided by the embodiment of the invention at least can improve the photoelectric conversion efficiency of the back contact cell.

The invention belongs to the technical field of perovskite solar cells, and provides synthesis and application of a novel self-assembled monomolecular hole transport material with conjugated extended tail ends. According to the self-assembled monomolecular hole transport material, a carbazole group is used as a terminal core, an aromatic ring is introduced to the terminal of carbazole to extend a conjugated structure, an alkyl chain is used as a connecting unit, phosphoric acid or acetic acid is used as an anchoring group, and the self-assembled monomolecular hole transport material with conjugated extended terminal is formed. And the stability, the hole transport property, the hole extraction capability and the interface passivation capability of the material are improved. Experiments show that the self-assembled monomolecular hole transport material has an HOMO energy level matched with a perovskite layer, and hole transport is facilitated. When the self-assembled monomolecular hole transport material disclosed by the invention is applied to a trans-perovskite solar cell with a band gap of 1.53 eV, the photoelectric conversion efficiency as high as 26.11% is obtained, and excellent device stability is shown.

The invention relates to a photovoltaic module, the photovoltaic module comprises three battery string groups which are connected in series, each battery string group comprises four battery strings which are connected in parallel, each battery string comprises a plurality of fragmented battery pieces, and each fragmented battery piece is a quarter piece formed by cutting a whole battery piece; the three battery string groups which are connected in series are distributed along a first direction, and a plurality of fragmented battery pieces in the battery strings are distributed along a second direction; the heads and the tails of the battery strings are connected with the bus bars, the bus bars comprise first bus bars located at the two ends of the photovoltaic module in the second direction and second bus bars located in the middle of the photovoltaic module in the second direction, and the first bus bars are located on the back face of the photovoltaic module. According to the photovoltaic module, on one hand, one half of the fragmented battery piece in the battery string is replaced by one fourth of the fragmented battery piece, and on the other hand, the photoelectric conversion efficiency of the photovoltaic module is relatively high by enabling the first bus bar to be located on the back surface of the photovoltaic module.

The invention discloses a hybrid passivation back contact battery and a preparation method thereof, the battery comprises a silicon wafer, the silicon wafer comprises a first surface and a second surface which are oppositely arranged, the second surface comprises a first area and a second area, and the area of the first area is larger than that of the second area; the heterostructure comprises a first passivation layer and a first doping layer which are at least stacked on the first region; the first electrode structure is located on the first doping layer in the heterostructure; the first passivation structure comprises a tunneling oxide layer and a second doping layer which are stacked on the second region; the second electrode structure is located on the second doping layer in the first passivation structure, and the first electrode structure and the second electrode structure are electrically isolated through an isolation groove; and the second passivation structure is located on the first surface of the silicon wafer. The passivation effect of the HTBC battery is good, and the photoelectric conversion efficiency can be remarkably improved; and the preparation process of the battery is simple, few in process steps and low in equipment cost.