Crystal silicon solar battery with multi-hole silicon layer structure

Abstract

The invention relates to a solar cell, in order to solve the structural problem of the crystal silicon solar cell. The invention discloses a porous silicon layer structural crystal silicon solar cell, whose structure comprise in sequence: a N-type silicon layer, a P-type silicon layer, a back electrode, and a PN junction with photovoltaic effect formed on the boundary of the N-type silicon layer and the P-type silicon layer, which is charactered in that a nanometer porous silicon layer is provided on the silicon material surface at one side near to the light-receiving surface, and there are nesa structure on the surface of the nanometer porous silicon layer. The invention has made improvement in the existing structure, increasing a nanometer porous silicon layer, thus raising the photoelectric conversion efficiency of the solar cell. Because the dimension of quasi aperture and quasi hole wall of the nanometer porous silicon layer is between 2 nanometer to 300 nanometer, and the thickness of nanometer porous silicon layer is thinner, the thinner crystal silicon layer can be used to achieve the same light quantum turnout with a thicker crystal silicon layer. Therefore it saves the valuable semiconductor silicon material, and reduces the cost.

Description

technical field [0001] The invention relates to a solar cell, in particular to a crystalline silicon solar cell with a nano-crystal structure, and the nano-crystal is formed by a porous silicon structure. Background technique [0002] The structure of the existing crystalline silicon solar cell consists of light-receiving surface electrodes, anti-reflection film, N-type silicon and surface texture structure, P-type silicon, and a PN junction with photovoltaic effect formed at the junction of N-type silicon and P-type silicon. composed of electrodes. The structure of this crystalline silicon solar cell has the following problems: First, the surface texture structure of the cell is a periodic or non-periodic structure of protrusions or depressions, and the typical size of these microstructures is on the order of microns to reduce incident The reflection of light is for the purpose, and there is no quantum size effect; the second is that the P-type silicon material and the N-t...

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Problems solved by technology

[0003] Aiming at the defects existing in the prior art, in order to solve the structural problems of the existing crystalline silicon solar cells, the present invention provides a crystalline silicon solar cell with a porous silicon layer structure, which can improve the photoelectric conversion efficiency of the cell, and can be used at a thinner crystalline silicon layer thickness. high light quantum yield in the case of

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