4results about How to "Reduce surface recombination rate" patented technology

This application relates to solar cells, sliced ​​solar cells, tandem solar cells, and photovoltaic modules. The solar cell includes: a substrate having a first surface and a second surface disposed opposite each other in the thickness direction; a groove structure formed on the first surface, the groove structure including a bottom surface recessed inward relative to the first surface, a side surface extending from the first surface toward the bottom surface in the thickness direction, and an inclined surface extending obliquely from one end of the side surface away from the first surface and connected to the bottom surface, the side surface being perpendicular to the bottom surface, the angle between the inclined surface and the bottom surface being 32° to 48°, and the ratio of the height of the side surface to the height of the inclined surface in the thickness direction being 2:1 to 11:1; and a textured region formed on the first surface, the textured region including a first protrusion located at the edge of the groove structure, the first protrusion being a truncated pyramid. This application can improve photoelectric conversion efficiency.

The utility model provides a kind of solar cell belongs to solar cell technical field, comprising: cell piece, passivation film layer is arranged on the front and / or back of cell piece, the thickness of passivation film layer exists thickness difference in the middle region of solar base and its edge region.The passivation film layer of thickness gradually changing is used in the front and / or back of cell of the application.When the film thickness of cell middle region is less than the film thickness of edge region, the incident light utilization of cell middle region can be increased while the passivation effect of cell edge region is enhanced.When light source mainly irradiates cell edge region, the amount of light of middle region is less, then the change trend that passivation film layer thickness in middle region is greater than edge region is used, to ensure the high incident light utilization of edge and the best passivation effect of middle region, improve the photoelectric conversion efficiency of overall cell.

The application provides a preparation method of a BC battery solving a front side wrap plating problem, a BC battery and a photovoltaic system, and relates to the technical field of photovoltaic cells. The method comprises the following steps: after polishing a silicon wafer, a first tunneling layer and a first poly layer are arranged on one side of the silicon wafer in sequence, a boron-doped passivation layer is arranged on the first poly layer, and a first laser opening mold is performed to obtain a first silicon wafer; a second tunneling layer, a second poly layer and a phosphorus-doped passivation layer are arranged on an N+ region of the first silicon wafer; a gap region is divided, a second laser opening mold is performed on the gap region by using a second laser to obtain a second silicon wafer; the second silicon wafer is subjected to rough polishing treatment and texturing treatment in sequence to obtain a third silicon wafer; an aluminum oxide layer is arranged on the surface of the third silicon wafer, and a silicon oxynitride layer is arranged on the surface of the aluminum oxide layer. The method can effectively remove the edge wrap plating layer by adding rough polishing treatment before texturing, so that the edge wrap plating layer can be effectively removed, and a normal textured surface can be prepared.

The invention relates to the technical field of photovoltaic cell manufacturing, in particular to a photovoltaic cell manufacturing process parameter self-adaptive regulation and control system and method, and the system comprises a diffusion module which is used for carrying out the diffusion processing of a textured silicon wafer, and obtaining a diffusion sheet; the coating module is used for carrying out coating treatment on the etched silicon wafer at preset radio frequency power and preset process cavity pressure to obtain a coated silicon wafer; a data acquisition module; the control module is used for judging whether diffusion processing of the diffusion sheet meets a preset standard or not according to the minority carrier lifetime distribution characterization value of the diffusion sheet and judging whether coating processing of the coated silicon wafer meets the preset standard or not according to the film layer distribution characterization value of the coated silicon wafer; an adjusting module; and the optimization module is used for determining an optimization strategy under the condition that the coating treatment of the coated silicon wafer does not meet the preset standard according to the defect grid unit proportion of the coated silicon wafer. According to the invention, the manufacturing efficiency of the photovoltaic cell is improved.