Method for preparing high efficiency solar cell with stereostructure

Abstract

The invention discloses a method for preparing a high efficiency solar cell with a stereostructure. The method comprises the followings steps that: thermal oxidation is carried out on a crystalline silicon cell so as to form a SiO2 film; laser grooving is carried out on the crystalline silicon cell and thus the crystalline silicon cell is etched into a structure with a ''towering building shape'', wherein the structure is formed in a direction vertical to the surface and the towering buildings are mutually connected; an alkaline solution is employed to remove damages on the surface of the crystalline silicon cell; an acid solution is employed to neutralize surplus alkali so as to remove oxide on the surface of the crystalline silicon cell; texturing is carried out on the surface of the crystalline silicon cell to form a nanopillar structure; diffusion is carried out on the surface of the crystalline silicon cell to form a PN node as well as phosphosilicate glass that is formed during the diffusion process is removed; oxidation is carried out on the surface of the crystalline silicon cell and then a SiN film is deposed and surface passivation is carried out to form a composite attenuated layer; an aluminium back field is printed and laser sintering is carried out on an aluminium electrode; and screen printing or evaporation is carried out on a metal electrode at the other surface of the crystalline silicon cell and then electrode alloying is carried out to form a high efficiency solar cell with a stereostructure. According to the invention, conversion efficiency of a solar cell is improved.

Description

technical field [0001] The invention relates to the technical field of solar cell preparation, in particular to a method for preparing a three-dimensional structure high-efficiency solar cell, which uses a laser to improve the efficiency of a crystalline silicon solar cell, divides the battery sheet into a "building shape", prepares a three-dimensional structure solar cell, and improves the efficiency of the solar cell. light trapping performance. Background technique [0002] In order to meet the growing living needs of human beings, the demand for energy is increasing, and the exploitation and utilization of energy is intensifying. Fossil energy reserves such as oil and coal are limited and will soon be exhausted. Due to the exploitation and utilization of fossil energy, it has caused great damage to the earth environment on which human beings depend, and directly threatens the survival of human beings. Therefore, it is extremely urgent to find new energy sources to solv...

AI Technical Summary

Problems solved by technology

[0004] Although crystalline silicon cells have disadvantages such as low conversion efficiency (large-scale mass production can reach 17%) and high prices, crystalline silicon cells still account for more than 90% of the market share, so the reduction of power generation costs depends on raw materials In addition to price, it is more important to improve the conversion efficiency of existing batteries

Conventionally, there are various means to improve the efficiency of crystalline silicon solar cells, such as selective emission, back surface field, surface passivation, etc., but the ability of these technologies to continue to improve the efficiency of solar cells is limited

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