Preparation method of hydrophobic light trapping structure on silicon surface

Abstract

The invention discloses a preparation method of a hydrophobic light trapping structure on silicon surface, belonging to the technical field of the solar cell. The method adopts the silicon wafer (100) or (111) and comprises the following steps: using hot sodium hypochlorite solution and HF to clean and obtain a clean silicon surface; corroding single crystal silicon with alkaline corrosive agent to form the texture with pyramid-shaped surface, or performing catalytic etching with precious metal nanoparticles, namely plating silver on the surface of the silicon wafer through the silver mirror reaction and soaking the silicon wafer plated with silver in acidic corrosive agent; and obtaining the light trapping structure of the antireflection layer. By adopting the light trapping structure, the emissivity can be reduced to 5% in the visible wave band from 380nm to 780nm. By adopting the method of the invention, the technological process of the precious metal nanoparticle plating can be simplified, the characteristics of normal-temperature wet etching can be maintained and the silicon surface can have higher antireflection effect. In addition, the contact angle of the surface of the silicon wafer (100) is up to 110 degrees, the silicon wafer has super hydrophobicity and the new technical means is provided for increasing the efficiencies of the silicon and silicon film solar cells.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a method for preparing a hydrophobic silicon surface light-trapping structure in the preparation of solar cells. It specifically relates to the noble metal nano-particle catalytic etching process technology for the preparation process of the silicon surface anti-reflection light trapping structure. Background technique [0002] Silicon solar cells occupy a dominant position in the solar cell market due to the wide source of raw materials and low cost. Reducing cost and improving conversion efficiency are the key directions of solar cell research. Reducing the reflection of incident sunlight on the light-receiving surface of the cell is one of the means to improve the photoelectric conversion efficiency of the solar cell. The commonly used anti-reflection measures mainly include etching silicon substrates by traditional methods, and preparing anti-reflection films such as Ti...

AI Technical Summary

Problems solved by technology

These methods generally require complex equipment and high operating costs

Images