Broad-spectrum absorption black silicon solar cell structure and preparation method thereof

Abstract

The invention discloses a broad-spectrum absorption black silicon solar cell structure. The structure sequentially comprises an irradiated face broad spectrum light trapping layer, a p-shaped silicon substrate, a n-shaped phosphorous diffusion layer and a backlight surface broad-spectrum absorption black silicon layer from top to bottom. The invention simutaneously discloses a preparation method of the broad-spectrum absorption black silicon solar cell structure. In the invention, the characteristics of the black silicon material can be fully utilized to enable sunlights entering into the cell to be almost absorbed; simutaneously a back dopant gradient can be utilized to separate eletron-hole pairs generated in the black silicon by a self-configuration field separation method, so that the eletron-hole pairs can be received and transfomred into light current by electrodes, thereby solving the problem that the traditional silicon substrate cell can not absorb and transform solar spectrum of which the wavelength is above 1.1 microns; and the PN junction of the structure is formed by diffuse junctions, the open-circuit voltage of the cell can be ensured not to be influenced by lowered black silicon lower-energy photon conversion, thereby effectively improving the photoelectric conversion efficiency of the silicon substrate sollar cell.

Description

technical field [0001] The invention relates to the technical field of silicon-based solar cells, in particular to a broad-spectrum absorption black silicon solar cell structure and a manufacturing method thereof. Background technique [0002] Solar energy is an inexhaustible, non-polluting, renewable and clean energy with the greatest potential for development. The silicon material abundant on the earth is the best material for making solar cells. However, the cost of power generation of silicon-based cells is still relatively high at present. It is difficult to popularize civilian use. An important way to reduce the price of electricity generated by silicon-based solar cells is to improve the photoelectric conversion efficiency of the cells. The main technical means currently used are to reduce the reflectivity of light on the surface of the battery, such as the use of transparent anti-reflection electrode film, pyramid textured surface, porous silicon light-trapping surf...

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Problems solved by technology

[0007] In view of this, the main purpose of the present invention is to propose a broad-spectrum absorption black silicon solar cell structure and its manufacturing method to solve the problem that traditional silicon-based cells cannot absorb and convert the solar spectrum with wavelengths above 1.1 microns due to the limitation of infrared absorption. Improving the photoelectric conversion efficiency of silicon-based solar cells

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