Silicon-based multi-junction tandem solar cell with flexible substrate and interlayer

Abstract

The invention discloses a silicon-based multi-junction tandem solar cell with a flexible substrate and an interlayer. The solar cell comprises a metal foil or polyester film flexible substrate, a back reflector electrode, a microcrystalline silicon or amorphous silicon germanium bottom cell, an interlayer and an amorphous silicon top cell, which are sequentially arranged from bottom to top, and a top cell, wherein the top electrode is a transparent conductive thin film; and the interlayer is a transparent conductive thin film located between the top cell and the bottom cell, can reflect short-wavelength light with a wavelength smaller than 650nm to 700nm and can transmit long-wavelength light with a wavelength larger than 650nm to 700nm. The interlayer can reflect a portion of incident light originally entering the bottom cell to the top cell so as to increase the short-circuit current density of the top cell. The cell structure provided by the invention is good to improve the short-circuit current density of the silicon-based multi-junction tandem solar cell, thereby improving photoelectric conversion efficiency and stability of the cell.

Description

technical field [0001] The invention relates to a photovoltaic cell, in particular to a flexible substrate silicon-based multi-junction lamination thin film solar cell including an intermediate layer. Background technique [0002] In the thin-film solar cells widely used at present, amorphous silicon thin-film materials are mainly used, but there are two important problems in amorphous silicon thin-film solar cells: (1) the light-induced degradation effect makes the battery stability not ideal; (2) The gap is wide, and the material itself does not fully absorb long-wave light in the solar radiation spectrum, which limits the further improvement of cell efficiency. In order to solve these two problems, research work on amorphous silicon / microcrystalline silicon stacked solar cells and amorphous silicon / amorphous silicon germanium stacked solar cells has been widely carried out in recent years. The amorphous silicon (a-Si:H) material used for the top cell has a strong light-i...

AI Technical Summary

Problems solved by technology

[0002] In the thin-film solar cells widely used at present, amorphous silicon thin-film materials are mainly used, but there are two important problems in amorphous silicon thin-film solar cells: (1) the light-induced degradation effect makes the battery stability not ideal; (2) The gap is wide, and the material itself does not fully absorb long-wave light in the solar radiation spectrum, which limits the further improvement of cell efficiency.

[0003] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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