Full-spectrum absorption enhanced hydrogenated amorphous silicon hydride thin film solar cell

Abstract

The invention provides a full-spectrum absorption enhanced hydrogenated amorphous silicon hydride thin film solar cell, which comprises a metal back electrode (1), nano-silver structure arrays (2), a photosensitive layer a-Si:H thin film (3), nano a-Si:H conical structure arrays (4) distributed in the two-dimensional period and nano ITO (Indium Tin Oxide) conical structure arrays (5) distributed in the two-dimensional period, wherein the nano-silver structure arrays (2) are arranged on the metal back electrode and are distributed in a two-dimensional period; parts between the nano-silver structure arrays (2) distributed in the two-dimensional period are filled with transparent conducting medium of indium tin oxide (ITO); and parts between the nano ITO conical structure arrays are filled with ITO and are distributed in the two-dimensional period. According to the hydrogenated amorphous silicon hydride thin film solar cell disclosed by the invention, the a-Si:H and ITO conical structure arrays are introduced on the upper surface of the photosensitive layer so as to ensure photons with higher projectile energy reach impedance matching during entering the photosensitive layer and further acquire short waveband for absorbing and enhancing; and the nano-silver periodic structure arrays are introduced to the lower surface of the photosensitive layer to enable photons with lower energy to be located to the photosensitive layer and further acquire long waveband absorbing and enhancing. Therefore, the light absorbing and enhancing effect in the full spectrum is realized, which is conductive to greatly improve the photoelectric conversion efficiency of the solar cell.

Description

technical field [0001] The invention relates to a hydrogenated amorphous silicon (a-Si:H) thin-film solar cell structure, in particular to a hydrogenated amorphous silicon with enhanced polarization-insensitive full-spectrum light absorption that realizes wide spectrum by means of nanoperiod arrays (a-Si:H) Thin Film Solar Cells. Background technique [0002] Energy issues have become a common crisis faced by the whole world in the 21st century. Solar energy is an important new energy source to solve the energy crisis, and solar cells are an important branch to realize photoelectric conversion. There are two main types of solar cells on the market: crystalline silicon solar cells and thin-film solar cells. In order to ensure sufficient optical absorption of crystalline silicon solar cells, the photosensitive layer should be thick enough, generally ~10 2 -10 3 μm, which has a great demand for silicon materials; and the biggest advantage of thin-film solar cells is to save ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the unsatisfactory absorption characteristics of thin-film solar cells and the inability to fully utilize full-spectrum sunlight, and at the same time solve the problem of incident light caused by the introduction of one-dimensional nano-metal gratings in other scientific research work. Polarization Sensitivity Issues

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