Novel double-layer-film back-passivated solar cell structure

Abstract

The invention discloses a novel double-layer-film back-passivated solar cell structure. The structure comprises silver electrodes, silicon-nitride dielectric films, an aluminum back field and a silicon substrate, wherein a layer of alumina passivation film and a layer of silicon oxynitride passivation film are further arranged on each silicon-nitride dielectric film, and a plurality of grooves are formed in back fields of the silicon-nitride dielectric films, the alumina passivation films and the silicon oxynitride passivation films and are distributed uniformly. The novel double-layer-film back-passivated solar cell structure has the advantage that the photoelectric conversion efficiency of a solar cell is further increased.

Description

technical field [0001] The invention relates to a solar cell structure, in particular to a double-layer passivation film solar cell structure comprising an atomic layer deposition aluminum oxide passivation film and a PECVD deposition silicon oxynitride passivation film. Background technique [0002] At present, in the structure of traditional solar cells, the short-wave response of the solar spectrum and the series resistance are always a pair of contradictions, which restricts the photoelectric conversion efficiency of the cell. In order to solve the contradiction between the two, in recent years, people have devoted themselves to the development of high-efficiency batteries with new battery structures, such as the PESC and PERL structure new batteries developed by the laboratory of the University of New South Wales, which make the conversion efficiency of the battery reach 24.5%. The current industrialized selective emitter cell (SE solar cell) is a further improvement on...

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Problems solved by technology

Therefore, these two technical difficulties limit the popularization of selective emitter cells

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