Nanometer structure copper zinc tin sulfide (CZTS) film photovoltaic cell and preparation method of nanometer structure CZTS film photovoltaic cell

Abstract

The invention discloses a nanometer structure copper zinc tin sulfide (CZTS) film photovoltaic cell, which sequentially consists of a substrate, a back electrode, a p type semiconductor nanometer wire array, an n type semiconductor thin layer, a window layer and a metal grid electrode, wherein the p type semiconductor nanometer wire array consists of semiconductor alloy (CuxB<1-x>)2Cy(DzS<1-z>), wherein x is greater than 0 but is smaller than or equal to 1, y is greater than or equal to 0 but smaller than or equal to 2, z is greater than or equal to 0 but smaller than 1, B is silver and / or gold, C is more than one kind of materials of aluminum, zinc or tin, D is selenium and / or tellurium. Through the subsequent processes of controlling the deposition element types, the deposition element sequence, the heat treatment mode and the like, the ingredients, the phase structure and the energy band structure of the absorption layer nanometer wire array are regulated, so the solar photovoltaic cells with different structures and performance can be prepared. The nanometer structure CZTS film photovoltaic cell provided by the invention has the advantages that the light reflection is reduced, good light capture capability is realized, the band gap regulation is improved, and the great improvement of the photoelectric conversion efficiency is finally realized.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic cells, and in particular relates to a nanostructure CZTS thin film photovoltaic cell and its preparation method and application. Background technique [0002] The survival and development of human beings are inseparable from energy and the environment. With the rapid development of the world economy, the energy crisis and environmental problems are becoming increasingly severe, and become one of the major problems that human beings urgently need to solve in the 21st century. Therefore, the importance of developing clean and renewable energy is becoming increasingly prominent. Solar energy is inexhaustible and inexhaustible clean energy. Sunlight covers a wide range of the entire earth. As long as there is sun, we can use solar energy to generate electricity. [0003] At present, the solar cells used in the market are still dominated by monocrystalline silicon / polycrystalline silicon c...

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Problems solved by technology

[0010] The above-mentioned methods can prepare CZTS films with high quality and good uniformity, but the conversion efficiency of the CZTS thin film solar photovoltaic cells is low, which is not only lower than the photoelectric conversion efficiency of 9.66% of the CZTS thin film solar cells prepared in the laboratory, but also Far below the theoretical conversion efficiency

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