Silicon solar battery

Abstract

The invention discloses a silicon solar cell structure, including a battery back electrode, a semiconductor silicon substrate and a semiconductor film layer having Fermi energy level different from the semiconductor silicon substrate. A quasi one-dimensional nanocrystalline body structure is prepared at the surface of material light-receiving surface in the semiconductor silicon substrate. The hole of this nanocrystalline body structure layer is filled by the semiconductor film layer, both of which form a heterojunction having the action of separating the photon-generated carrier. Because of the use of the quantum size effect, the volume effect and the surface effect in the structure, the silicon material with lower purity is used to make the silicon solar cell, and a satisfactory photoelectric conversion efficiency is obtained.

Description

technical field [0001] The invention relates to a solar cell, especially a silicon solar cell that can be manufactured using low-purity crystalline silicon. Background technique [0002] A solar cell is a type of photovoltaic device that directly converts light energy into electrical energy. At present, such devices are mainly made of semiconductor materials. Using the PN junction of semiconductor materials or other structures that can generate self-built electric fields in semiconductor materials, the carriers excited by incident light are separated, and current is generated in the loop through an external circuit. In order to ensure that the carriers excited by the incident light will not be annihilated due to recombination before being separated by the self-built electric field, semiconductor materials are usually required to have extremely high purity. Currently, known silicon solar cells are the most widely used semiconductor silicon material, and its purity is requir...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems that the existing silicon solar cell manufacturing technology has too high requirements on the purity of silicon materials, resulting in high costs, and the consumption of a large amount of electric energy and chemical raw materials in the process of preparing high-purity silicon, and the risk of causing environmental pollution, etc., this project The purpose of the invention is to provide a silicon solar cell, the structure of which can be manufactured using silicon materials with lower purity, and obtain solar cells with higher commercial value

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