17results about How to "Reduce compound rate" patented technology

The embodiment of the invention relates to the field of solar cells, provides a solar cell and a preparation method thereof, and at least can solve the problem that the performance of a fragmented cell is poor. The solar cell comprises fragmented cells, at least two fragmented cells are formed by segmenting the same whole solar cell along a first direction, and each fragmented cell comprises a first surface, a second surface and a third surface connected with the first surface and the second surface, the first surface is a partial area of the front surface of the whole solar cell, the second surface is a partial area of the back surface of the whole solar cell, and the third surface is a cross section of the fragmented cell after segmentation processing; the crystalline silicon layer is positioned on the third surface; the silicon oxide layer is positioned on the surface of the crystalline silicon layer; and the metal oxide layer is positioned on the silicon oxide layer.

The invention belongs to the technical field of back contact cells, and particularly relates to a back contact cell with a multi-layer gradient textured structure and a manufacturing method and application of the back contact cell. A second semiconductor opening region further comprises a first platform region and a second platform region which are sequentially arranged from the edge to a non-transition region in the width direction; the first slope area is arranged between the first platform area and the second platform area; the second slope area is arranged between the second platform area and the non-transition area; wherein the first platform area is a polished surface, the second platform area is a pyramid suede surface, the heights of the first platform area, the second platform area and the non-transition area are gradually reduced, and the first platform area, the first inclined surface area, the second platform area, the second inclined surface area and the non-transition area continuously form a multi-layer gradient suede surface structure. According to the invention, the situation that the second semiconductor layer in the second semiconductor opening region cannot well coat the surface and the side surface due to a relatively large height difference can be avoided, and the carrier recombination rate at the boundary is reduced, so that the open-circuit voltage and the cell conversion efficiency are improved.

The invention relates to a photovoltaic cell and a preparation method, and the preparation method enables a doped conductive layer of the prepared photovoltaic cell to have a high-low junction, and the high-low junction facilitates the promotion of electron or hole migration, and facilitates the reduction of Auger recombination rate. According to the preparation method disclosed by the invention, the thickness size of the first doped conductive layer in the doped conductive layers of the prepared photovoltaic cell is smaller than that of the second doped conductive layer, so that most of light reflected by the environment can enter the silicon substrate through the first doped conductive layer; therefore, the silicon substrate can generate more photo-generated holes and photo-generated electrons after absorbing more light. In addition, the area of the contact surface between the second doped conductive layer and the metal electrode is large, and the contact resistance between the second doped conductive layer and the metal electrode is small. Therefore, the photovoltaic cell prepared by the preparation method is relatively high in photoelectric conversion efficiency.

The invention relates to the technical field of TOPCon solar cells, in particular to a TOPCon photovoltaic cell structure and a preparation method thereof, and the method comprises the steps: preparing a local patterning mask on a tunneling oxide layer through nanometer imprinting; and etching by using a high-selectivity etching agent and depositing a passivation layer, forming a local passivation structure on the polycrystalline silicon substrate, removing a mask material, depositing a polycrystalline silicon emitter layer and preparing an electrode, and forming a TOPCon photovoltaic cell structure. According to the invention, the local patterning mask is prepared on the tunneling oxide layer by using the nano imprinting technology, the high-selectivity etching solution is combined to form the local patterning structure, and finally the passivation layer material is deposited in the etched area to form the local patterning passivation layer, so that the contact interface is optimized, the recombination current between the front electrode and the silicon substrate is reduced, and the performance of the device is improved. Therefore, the open-circuit voltage and the filling factor of the cell are improved, and the photoelectric conversion efficiency is improved.

The invention discloses a back contact cell, a back contact cell string and a solar cell module, the back contact cell comprises first doped regions, second doped regions and isolation regions, the first doped regions, the second doped regions and the isolation regions are arranged on the back surface of a silicon substrate, the first doped regions and the second doped regions are alternately arranged, the isolation regions are arranged between the first doped regions and the second doped regions, and the isolation regions are arranged between the first doped regions and the second doped regions. The doping types of the first doped region and the second doped region are opposite; the side wall, close to the isolation region, of the first doped region is recessed inwards to form a first recessed region, and the first recessed region comprises a plurality of first recessed units which are connected in sequence. According to the invention, carrier transmission between the first doped region and the second doped region can be improved.

The invention discloses a preparation method of graphene nano copper yttrium oxide composite powder, and relates to the technical field of photocatalytic wastewater treatment and new materials. The preparation method comprises the following steps: adding absolute ethyl alcohol and starch into ultrapure water, uniformly stirring, adding graphene, performing ultrasonic dispersion, adding urea, a copper sulfate solution and a yttrium nitrate solution, and uniformly stirring to obtain a mixed solution; adding the mixed solution into a supercritical reaction device, setting a heating program, preserving heat, cooling to room temperature, taking out a reactant, centrifuging, filtering, washing and drying to obtain the graphene nano copper oxide composite powder. Nano copper oxide and nano yttrium oxide are uniformly intercalated and distributed in pores and the surface of redox graphene, the yttrium oxide increases the active surface area of copper oxide, excitons are effectively generated in a metal oxide system, the photocatalytic activity of the graphene nano copper oxide yttrium composite powder is remarkably improved, and the graphene nano copper oxide yttrium composite powder has a wide prospect in the aspect of treating organic wastewater.

The present invention belongs to the field of marine antifouling coatings, and specifically relates to a green marine self-cleaning antifouling coating and a preparation method thereof. x Fe y Ti z C a N b O c , its crystal form is rutile, and the lattice spacing is 3.63Å. The catalyst is added to the coating as a green marine self-cleaning antifouling coating. The active free radicals generated by the green marine self-cleaning antifouling coating under sunlight can decompose organic matter and bacteria attached to the surface of the coating into carbon dioxide and water, and form a super hydrophilic film on the surface, which can prevent the attachment of fouling organisms. The green marine self-cleaning antifouling coating of the present invention has the functions of maintenance-free and self-cleaning. The coating is green and environmentally friendly, simple to prepare and has a wide range of uses, and can effectively improve the performance and service life of marine facilities.

The invention provides an antibacterial polyester superfine fiber and a preparation method thereof, and the preparation method comprises the following steps: preparing an antibacterial agent: taking water / isopropanol with the volume ratio of 1: (5-8) as a solvent, adding a Mo source, an S source and a doped element Bi source into the solvent, uniformly mixing, and transferring into a high-pressure reaction kettle for reaction; dissolving the prepared Bi-MoS2 in deionized water, adding a Ce source and urea, uniformly mixing, transferring into a high-pressure kettle, and carrying out microwave hydrothermal reaction to obtain a Bi-MoS2 / CeO2 antibacterial agent; dissolving polyester in an organic solvent, uniformly mixing, adding an antibacterial agent, and uniformly mixing to obtain a mixed solution; the mixed solution is subjected to electrostatic spinning, and the antibacterial polyester superfine fibers are obtained.The antibacterial polyester superfine fibers have the advantages that antibacterial materials are elaborately designed from four angles including material components, morphology regulation, ion doping and heterostructure construction, antibacterial performance is effectively improved by means of electrostatic spinning and polyester compounding, antibacterial agents are prevented from falling off, and the antibacterial polyester superfine fibers are excellent in stability.

The application discloses a perovskite solar cell electron transport layer and a preparation method and application thereof, and relates to the technical field of solar cell preparation. The method comprises the following steps: adding O-phospho-L-threonine into a SnO2 colloidal aqueous solution, and performing ultrasonic treatment to obtain a PT-doped SnO2 solution; and coating the PT-doped SnO2 solution onto the surface of a substrate to form a perovskite solar cell electron transport layer. The unique molecular structure of O-phospho-L-threonine (PT) is utilized to realize a multiple synergistic modification effect, and the device performance is improved. The preparation process is simple. The application solves the problems of the existing perovskite solar cell, such as many defects of the electron transport layer, poor interface energy level matching, serious charge recombination and poor device stability.

The present invention relates to the technical field of H01B1 / 16, and specifically to a PERC crystalline silicon solar back side silver paste and a preparation method thereof. The silver paste comprises a silver powder paste combination, a mixed metal oxide paste and an inorganic auxiliary agent paste. The silver powder paste combination comprises a silver powder paste with a D50 of 50nm-1μm. By optimizing the back side silver paste formula, the silver content of the back side electrode silver paste for the PERC crystalline silicon solar cell is effectively reduced to 48-52% (weight percentage), thereby reducing the material cost of a cell sheet while ensuring the photoelectric conversion efficiency and welding performance of the cell sheet.

The invention discloses a flexible laminated perovskite solar cell and a preparation method of the flexible laminated perovskite solar cell. The solar cell sequentially comprises a flexible substrate, a bottom electrode, a carrier transport layer 1, a wide-band-gap perovskite light absorption layer, a carrier transport layer 2, a tunneling composite layer, a carrier transport layer 3, a narrow-band-gap perovskite light absorption layer, a carrier transport layer 4 and a top electrode from a light receiving front side to a light receiving back side. Wherein the wide-band-gap perovskite light absorption layer is made of a wide-band-gap perovskite material and a polymer elastomer. According to the invention, the polymer elastomer is introduced in the preparation process of the wide-band-gap perovskite light absorption layer, so that the waterproof performance of the wide-band-gap perovskite light absorption layer is enhanced, the thickness of the subsequent tunneling composite layer is reduced, and the bending resistance of the solar cell device is improved; and meanwhile, the problem that the wide-band-gap top cell is dissolved when the narrow-band-gap perovskite light absorption layer is prepared subsequently is solved.

The present invention discloses a solar cell with a composite dielectric passivation layer structure and a preparation process thereof, wherein a silicon oxide film, an aluminum oxide film, a silicon nitride or a silicon oxynitride film composite dielectric film layer are sequentially deposited on the front, back and peripheral surfaces of a P-type silicon substrate, and a window is opened locally for electrode extraction. The back surface passivation layer of aluminum oxide, silicon dioxide, silicon oxynitride, silicon nitride with different refractive indices and their laminated structures of the present invention greatly reduces the back surface recombination rate, improves the back reflectivity, and simultaneously reduces the component CTM, improves the cell light decay and thermally assisted light decay performance, and anti-PID performance; the structure can be made on boron-doped or gallium-doped P-type monocrystalline silicon, P-type polycrystalline silicon and P-type quasi-monocrystalline silicon substrates, and is compatible with the passivation method based on the composite dielectric film passivation structure for manufacturing PERC cells, double-sided PERC+ cells and shingled PERC cells; the preparation process steps and sequence of the laminated structure, the corresponding preparation method and the process parameter range can well complete the cell production.

This application relates to the photovoltaic field, providing a solar cell, a photovoltaic module, and a method for fabricating a solar cell. The solar cell includes: a substrate having a front side and a back side, the back side including a textured region and a flat region adjacent to the textured region, the textured region having a doped surface field, and the doped surface field containing a doped element, which is N-type or P-type; a tunneling dielectric layer located on the flat region of the back side of the substrate; a doped conductive layer located on the surface of the tunneling dielectric layer away from the back side of the substrate, the doped conductive layer containing a doped element, the type of which is the same as the type of which is doped in the doped surface field; and a back electrode, a portion of the bottom surface of the back electrode located within the doped conductive layer and in contact with the doped surface field, which can at least reduce the contact resistance of the solar cell.

The application relates to the technical field of solar cells, in particular to a solar cell, a solar cell preparation method, a laminated cell and a photovoltaic module. The solar cell comprises a substrate, the substrate comprises a first surface and a second surface arranged oppositely, and the substrate further comprises a third surface connecting the first surface and the second surface. The first surface comprises a first region close to the third surface and a second region away from the third surface, the distance between the first region and the second surface is smaller than the distance between the second region and the second surface, and the connecting position between the first region and the second region is a bevel. The first region comprises a first texture structure, and the third surface comprises a second texture structure. In the application, the first region is formed by performing a localized treatment on the cutting position on the first surface first, so that the first region is closer to the substrate, then the first region and the third surface are etched to remove the PN junction damage area and microcracks of the first region and the third surface, the recombination rate is reduced, the open circuit voltage and the circuit current are improved, and the conversion efficiency of the solar cell is improved.

The invention discloses a back contact cell, a back contact cell string and a solar cell module, the back contact cell comprises first doped regions, second doped regions and isolation regions, the first doped regions, the second doped regions and the isolation regions are arranged on a backlight surface of a semiconductor substrate, and the first doped regions and the second doped regions are alternately arranged along a first direction; the isolation region is arranged between the first doped region and the second doped region, and the doping types of the first doped region and the second doped region are opposite; the first side wall, close to the isolation region, of the first doping region protrudes towards the isolation region to form a first protruding region, and the first protruding region comprises a plurality of first protruding units arranged in the second direction; the second side wall, close to the isolation region, of the second doped region protrudes towards the isolation region to form a second protruding region, and the second protruding region comprises a plurality of second protruding units arranged in the second direction. According to the invention, carrier migration between the first doped region and the second doped region can be improved.

The invention belongs to but is not limited to the technical field of catalytic surface and interface and photocatalyst preparation, and discloses a titanium dioxide photocatalyst loaded with platinum nanoparticles and application of the titanium dioxide photocatalyst in photocatalytic nitrogen oxide reduction synthesis ammonia. TiO2 is used as a core, Pt nanoparticles are loaded on the surface of the TiO2 through a precipitation method or an impregnation method, and the TiO2 / Pt nano-composite photocatalyst is prepared. And the Pt nano particles are synthesized from an H2PtCl6 precursor. The Pt nano-particles in the Pt nano-particle loaded TiO2 photocatalyst provided by the invention have strong dissociation capability on H2O, the problem that H < + > is difficult to protonate in gas-solid phase NOx photocatalytic synthesis ammonia is solved, the combination of NOx and H ions is promoted, and synthesis ammonia is gradually reacted, so that the conversion rate and selectivity of photocatalytic NOx reduction synthesis ammonia are greatly enhanced.

The application relates to the technical field of solar cells, and provides a back contact cell, a cell assembly and a photovoltaic system. In the back contact cell, a groove is formed on a third region of a silicon substrate, the groove further comprises a first connecting region between the groove and a first region, a first doped layer is located on the first region, a second doped layer is located on a second region, and a third doped layer is located on the first connecting region. The third doped layer comprises a first body part and a first transition part between the first body part and the first doped layer and the first body part and the first doped layer. The doping concentration of a first doped element in the first doped layer is greater than or equal to 100 times the doping concentration of the first doped element in the first body part. In this way, the carrier recombination rate of the region near the groove can be reduced while achieving an excellent insulation isolation effect, the surface recombination loss is reduced, and the efficiency of the back contact cell is improved.