3057 results about "Photoelectric conversion efficiency" patented technology

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 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.

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 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 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 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 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 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 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 provides a solar cell and a photovoltaic module, and belongs to the technical field of solar cells. The solar cell comprises a silicon substrate comprising a first surface and a second surface which are opposite to each other; the first surface of the silicon substrate comprises a plurality of conductive regions which are arranged at intervals, the doped conductive layers are arranged on the conductive regions respectively, and a groove which is concave towards the interior of the silicon substrate is formed between every two adjacent conductive regions; wherein the groove comprises two opposite side faces and a bottom face located between the two side faces, and at least part of the side faces are provided with a plurality of sheet-shaped structures. The light absorption capability of the solar cell and the photoelectric conversion efficiency of the solar cell are effectively improved, and the effective generating capacity of the solar cell in the life cycle can be improved.

The invention provides conductive paste, a solar cell, a preparation method of the solar cell and a photovoltaic module. The conductive paste comprises the following components in parts by weight: 70-85 parts of silver powder, 3-8 parts of glass powder, 0.1-2 parts of an additive and 12-25 parts of an organic carrier, wherein the silver powder comprises spherical silver powder and flaky silver powder; the glass powder is prepared from the following components in parts by weight: 65 to 75 parts of Bi2O3, 18 to 25 parts of TeO2 and 8 to 12 parts of V2O5; the additive is a carbon material and / or conductive metal oxide nanoparticles; the organic carrier comprises an infrared absorbing material; the infrared absorption material is selected from any one or more of copper phthalocyanine, a polyaniline-carbon nanotube compound and a tungsten oxide nanowire. The conductive paste can improve the conductivity of the conductive paste and improve the efficiency of the conductive paste in a laser sintering process, so that the contact resistivity is reduced, and the photoelectric conversion efficiency of a photovoltaic solar cell is improved.

The invention provides a perovskite thin film and a preparation method thereof, and belongs to the technical field of perovskite thin films, and the preparation method comprises the following steps: S1, preparing modified octa (aminophenyl trioxosilane); s2, preparing a precursor solution; and S3, spin-coating the pretreated substrate with the precursor solution, dropwise adding ethyl acetate at the same time, performing illumination treatment under ultraviolet light, and then immediately performing micro-vibration and curing annealing on the substrate to obtain the perovskite thin film. According to the perovskite thin film obtained by the invention, the purposes of synchronously increasing the open-circuit voltage and the filling factor of a solar cell, improving the photoelectric conversion efficiency and enhancing the long-term stability can be achieved.

The invention relates to a photovoltaic cell preparation method, a photovoltaic cell, a laminated cell and a photovoltaic cell module. Providing an initial battery piece; depositing and forming a protective layer on the surface; carrying out laser treatment twice; printing and sintering to form an electrode; and carrying out at least two times of laser-assisted sintering on the electrode. According to the photovoltaic cell preparation method, the protection layer at the first area is removed, the doping concentration at the first area is improved, and at least two times of laser-assisted sintering are combined, so that on one hand, the metal contact area is optimized, the usage amount of silver paste is reduced, the material cost is reduced, and meanwhile, paste contact sintering is enhanced; damage caused by laser grooving doping is removed; and on the other hand, the doping concentration is optimized, the contact resistance is remarkably reduced, the open-circuit voltage and the filling factor are favorably improved, the shading loss is reduced, and the current collection efficiency is ensured, so that the photoelectric conversion efficiency and the reliability of the cell are remarkably improved, the production process is simplified, and the production cost is reduced.

The invention belongs to the technical field of perovskite solar cells, and provides a dibenzofuranyl carbazole derivative and a preparation method and application thereof.The dibenzofuranyl carbazole derivative takes dibenzofuranyl carbazole as a functional group, molecular ordered accumulation is optimized, and hole mobility is remarkably improved; an alkyl carbon chain is used as a linking group, a phosphate group at the tail end is an anchoring group, perovskite interface defects can be effectively passivated, the energy loss at the interface can be reduced, single molecule self-assembly can be realized, the cell performance can be improved, and as a self-assembly monomolecular layer hole transport material, a perovskite solar cell has relatively high photoelectric conversion efficiency, and the photoelectric conversion efficiency can be improved. The service life is long; and the stability is high.

The invention relates to the field of photovoltaic power generation, and particularly discloses a climate self-adaptive photovoltaic cooling method and system based on interface evaporation, and the system comprises a hydrophilic and hydrophobic composite radiation refrigeration film which is used for capturing atmospheric moisture through a radiation refrigeration effect under a low-radiation condition to form a cooling water source; the bionic water conveying structure comprises a modified silicone tube and a juncus roemerianus bundle and is used for conveying the captured water to the high-level water tank through capillary action; according to the invention, by fusing interface evaporation and radiation refrigeration technologies, the system realizes efficient cooling and energy recovery of the photovoltaic module; under the condition of strong irradiation, the gradient wettability interface evaporation layer takes away waste heat of the module through directional water film flow, so that the temperature of the photovoltaic module is reduced, the photoelectric conversion efficiency is improved, and meanwhile, the daily generating capacity is increased; the cooling effect is obviously better than that of a traditional natural convection or phase change material cooling mode, and efficient heat transfer is achieved through phase change latent heat utilization of interface evaporation.

The utility model is suitable for the technical field of solar cells, and provides a back contact solar cell, a photovoltaic assembly and a photovoltaic system, the back contact solar cell comprises a silicon substrate, the back surface of the silicon substrate is provided with a plurality of first doped regions and a plurality of second doped regions which are sequentially and alternately arranged along a first direction, the polarities of the first doped region and the second doped region are opposite, the adjacent first doped region and second doped region are electrically isolated through a groove, the groove comprises a side wall and a bottom surface, the side wall is provided with a plurality of first miniature pyramid structures, the bottom surface is provided with a plurality of second miniature pyramid structures, the first miniature pyramid structures correspond to a second direction, and the second direction corresponds to a third direction. The second micro pyramid structure corresponds to a third direction, and the third direction is perpendicular to the bottom face and intersects with the second direction. Through the arrangement, the light trapping effect between the first micro pyramid structure and the second micro pyramid structure is good, and the light reflectivity is reduced, so that the photoelectric conversion efficiency of the back contact solar cell is improved.

The invention discloses a self-assembled monomolecular material based on pyrene-carbazole diphosphate and a preparation method and application thereof, and belongs to the technical field of perovskite solar cells. According to the material, two carbazole units and a pyrene core are in conjugate connection to form a large conjugate plane structure, and the material has the following advantages: 1) a rigid molecular skeleton and an expanded conjugate system significantly improve thermal stability and chemical stability; 2) the conjugate plane of pyrene enhances intermolecular pi-pi accumulation, and promotes hole extraction and transmission; and 3) energy level matching is accurately regulated and controlled, a compact interface layer is formed, and electron-hole recombination is inhibited. When the hole transport layer is applied to the trans-perovskite solar cell, the photoelectric conversion efficiency and the long-term stability can be improved at the same time, and the hole transport layer has a good industrialization prospect.

In the field of photovoltaic power generation, a solar cell and a solar cell module capable of improving photoelectric conversion efficiency are provided. [Solution] The solar cell has a first surface and a second surface arranged back to back, and the first surface has first and second regions arranged alternately, and the second region includes a substrate having a groove formed in it relative to the first region, a passivation contact structure located in the first region, a passivation layer covering the surface of the passivation contact structure and the inner wall surface of the groove, and a first electrode located on the passivation layer and electrically connected to the passivation contact structure, and the side of the groove or the side of the passivation contact structure has a recess that is recessed inward along a first direction that is the direction from the second region to the first region, and the recess includes a continuous first side surface and a second side surface, the first side surface is connected to the first region, and the angle between the first side surface and the second side surface is a first obtuse angle.

The invention relates to a compound, a preparation method, a hole transport layer material, a photovoltaic device and a photovoltaic module. R1 and R4 are respectively and independently selected from amino and derivatives thereof, hydroxyl and derivatives thereof, methoxyl and derivatives thereof, sulfydryl and derivatives thereof, methylthio and derivatives thereof, thiophene groups and derivatives thereof, phosphate groups and derivatives thereof, carboxylic acid groups and derivatives thereof, and sulfonic acid groups and derivatives thereof; r2 and R3 are independently selected from alkyl, a phosphate group and derivatives thereof, a carboxylic acid group and derivatives thereof, a sulfonic acid group and derivatives thereof, and trimethoxysilyl propyl and derivatives thereof. The material is beneficial to improving the photoelectric conversion efficiency of photovoltaic devices and photovoltaic modules.

The invention discloses a laminated solar cell structure containing a selective reflection / light transmission optical thin film. The laminated solar cell structure comprises a wide-band-gap solar cell, the selective reflection / light transmission optical thin film and a narrow-band-gap solar cell which are sequentially arranged in the light incidence direction. The selective reflecting / light-transmitting optical thin film is at least used for 1) reflecting high-energy photons to be absorbed and utilized by the wide-band-gap solar cell; and 2) low-energy photons are transmitted to be absorbed and utilized by a narrow-band-gap solar cell. According to the invention, the selective reflection / light transmission optical thin film is used to fully reflect the transmitted high-energy photons to the wide-band-gap top cell without influencing the transmission of low-energy photons, so that the absorption and conversion of the wide-band-gap top cell to the high-energy photons can be improved, the photoelectric conversion efficiency of the laminated cell can be effectively improved, and the laminated cell has a good application prospect.

The utility model discloses a perovskite battery assembly, a photovoltaic assembly and electric equipment, and relates to the technical field of batteries. The perovskite battery assembly comprises a first substrate and a perovskite battery functional layer. The perovskite cell function layer comprises a first electrode layer, a perovskite light absorption layer and a second electrode layer. The first electrode layer comprises a first scribe line, the perovskite light-absorbing layer comprises a second scribe line group corresponding to the first scribe line, and the second scribe line group comprises a plurality of second scribe lines, the perovskite light-absorbing layer and a third scribe line of the second electrode layer. Since the second lineation group comprises a plurality of second lineation lines, the second electrode layer can be connected with the first electrode layer through the plurality of second lineation lines, and the area of the dead zone of the perovskite cell function layer can be reduced by designing the first part and the second part in the third lineation line. And the photoelectric conversion efficiency of the perovskite battery assembly is improved.

The invention belongs to the technical field of photoelectric detection, and discloses a molybdenum ditelluride / nickel ditelluride heterojunction-based photoelectric detector and a preparation method and application thereof, and the molybdenum ditelluride / nickel ditelluride heterojunction-based photoelectric detector is prepared by stripping single crystal molybdenum ditelluride onto an oxide layer silicon substrate through a mechanical stripping method to obtain a molybdenum ditelluride nanosheet; a nickel ditelluride nanosheet is obtained through a chemical vapor deposition method; the molybdenum ditelluride nanosheet is transferred to the nickel ditelluride nanosheet through a PVA dry transfer method to form an overlapped part, and a molybdenum ditelluride / nickel ditelluride heterojunction is formed; and preparing electrodes at two ends of the molybdenum ditelluride / nickel ditelluride heterojunction through electron beam evaporation or thermal evaporation. The photoelectric detector utilizes a built-in electric field generated by a two-dimensional material heterojunction interface to effectively improve the photoelectric conversion efficiency and response speed of a visible light wave band.

The invention relates to the technical field of photovoltaic power generation, and discloses a solar cell and a preparation method thereof, and a photovoltaic module. The invention provides a solar cell. The doping concentration of a boron element in a first doped polycrystalline silicon layer is 8 * 10 < 19 > atoms / cm < 3 > to 8 * 10 < 20 > atoms / cm < 3 >; a second tunneling oxide layer, wherein the second tunneling oxide layer is arranged in the second region of the silicon substrate; and the second doped polycrystalline silicon layer is arranged on one side, far away from the silicon substrate, of the second tunneling oxide layer. Therefore, the high-doping-amount contact structure of the backlight surface of the solar cell has relatively high passivation quality and good contact characteristics, and carrier recombination and resistance loss can be reduced, so that the photoelectric conversion efficiency of the solar cell is improved.

The invention discloses a perovskite solar cell and a preparation method thereof, and belongs to the technical field of perovskite solar cells. SAM molecules are introduced between the hole transport layer and the perovskite active layer, the photoelectric conversion efficiency of the perovskite solar cell is improved, an interface modification layer comprising a sheet-shaped P-type semiconductor material is further introduced at the interface of the hole transport layer and the SAM layer, the interface of the hole transport layer / the SAM layer / the perovskite active layer is improved, and the photoelectric conversion efficiency of the perovskite solar cell is improved. The hole transport layer and the perovskite active layer are separated from each other, the energy level difference between the functional layers is reduced, the carrier extraction and transmission of an interface are enhanced, the sheet structure of the sheet P-type semiconductor material can cooperate with the compact SAM layer to block the direct contact between the hole transport layer and the perovskite active layer, and the hole transport efficiency is improved. And the reduction reaction of halide ions in an interinterface hole transport material and a perovskite material is effectively prevented.

The invention discloses a solar cell, a cell module and a photovoltaic system. The solar cell comprises a silicon substrate, a plurality of first doped regions and a plurality of second doped regions, wherein the first doped regions and the second doped regions are arranged on the first side of the silicon substrate; the first doped region and the second doped region are sequentially arranged along the first direction and are arranged at an interval; an isolation groove is arranged between the adjacent first doped region and second doped region, and the isolation groove is used for isolating the first doped region and the second doped region; the isolation grooves comprise first isolation grooves and second isolation grooves, and the first isolation grooves and the second isolation grooves are sequentially arranged at intervals in the first direction; the width of the first isolation groove along the first direction is smaller than that of the second isolation groove along the first direction, and the vertical projection of at least one of two opposite side walls of the second isolation groove along the first direction on the silicon substrate comprises a first concave-convex structure. The risk of hidden crack of the cell can be reduced, the reliability of the cell is improved, and the photoelectric conversion efficiency of the cell is improved.