Solar cell

Abstract

The embodiment of the invention provides a solar cell. The solar cell comprises a substrate; the emitting electrode, the first passivation film, the anti-reflection film and the first electrode are sequentially stacked on the upper surface of the substrate; the tunneling layer, the blocking layer, the field passivation layer, the second passivation film and the second electrode are sequentially stacked on the lower surface of the substrate, the blocking layer is used for blocking doping ions in the field passivation layer from migrating to the substrate, the blocking layer comprises a first blocking layer coinciding with the projection of the second electrode and a second blocking layer with the projection staggered, and at least the second blocking layer is an intrinsic semiconductor; in the direction perpendicular to the surface of the substrate, the thickness of the first blocking layer is smaller than that of the second blocking layer, the surface, away from the substrate, of the first blocking layer is flush with the surface, away from the substrate, of the second blocking layer, and the thickness of the tunneling layer coinciding with the projection of the second electrode is larger than that of the tunneling layer staggered with the projection of the second electrode. The embodiment of the invention is beneficial to reducing the recombination loss of the solar cell and improving the conversion efficiency of the solar cell.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application is a divisional application of a Chinese invention patent application with an application date of October 30, 2020, an application number of 202011192543.X, and an invention name of "solar cell". technical field [0003] Embodiments of the present invention relate to the field of photovoltaics, and in particular, to a solar cell. Background technique [0004] With the continuous development of solar cell technology, the recombination loss in the metal contact area has become one of the important factors restricting the further improvement of the conversion efficiency of solar cells. In order to improve the conversion rate of solar cells, the solar cells are often passivated by passivating the contacts to reduce the recombination in the solar cell and on the surface. Commonly used passivated contact cells include Heterojunction with Intrinsic Thin-layer (HIT) cells and Tunnel Oxide Passivated Contact (...

AI Technical Summary

Problems solved by technology

[0005] However, the existing passivated contact cells have a certain hidden danger of recombination loss

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