A kind of double-sided solar cell and its preparation method

Abstract

The invention discloses a two-sided solar cell. According to the two-sided solar cell, a photonic crystal reflecting layer (4), a second transparent electrode layer (3), a top cell layer (2) and a first transparent electrode layer (1) are sequentially deposited on one surface of a glass sheet (5); a third transparent electrode layer (6), a bottom electrode layer (7) and a metal back electrode layer (8) are sequentially deposited on the other surface of the glass sheet (5), and therefore the two-sided solar cell is obtained. The two-sided solar cell innovatively provides the theory that light current matching is regulated through the photonic crystal layer instead of tunnel junctions, and overcomes the defects that in a traditional solar cell, the conversion efficiency of a single cell is low, tunnel junctions of a plurality of cells are not easy to manufacture, and light currents of two cells are not prone to matching. The two-sided solar cell has the advantages that a laminated solar cell is divided into two parts which are manufactured on the two surfaces of the glass, tunnel junctions are omitted, and meanwhile photonic crystals are introduced to adjust light absorption so as to achieve the light current matching effect.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a double-sided solar cell and a preparation method thereof. Background technique [0002] With the rapid development of industrial society and the sharp increase in energy consumption, traditional fossil energy can no longer meet the needs of people's production and life, and among various new energy sources, the instability of wind energy, the localization of geothermal energy, and the safety of nuclear energy have become important issues. reasons for restricting its development. In contrast, solar energy is safe, clean, stable, and easy to use, which determines that it will be used as a major energy supply in the future. [0003] Solar cells are an effective means of utilizing solar energy. Traditional crystalline silicon solar cells have achieved considerable conversion efficiency, but their manufacturing costs are still high. In order to further reduce costs ...

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Problems solved by technology

The above patent applications can effectively utilize the energy of solar energy in various bands to a certain extent, but there are shortcomings such as high resistance of the intermediate layer or each interface of the battery, and difficult preparation of tunnel junctions.

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