A new approach to quantum tailoring to improve the efficiency of thin-film silicon solar cells

Abstract

The invention discloses a novel method for improving the efficiency of a Si-film solar cell through quantum cutting. A functional nanometer SiO2 film containing an upper conversion material and a lower conversion material is adopted to increase the absorption of light by the Si-film solar cell, SiO2 sol containing the upper conversion material and the lower conversion material is firstly prepared, then a film with controllable SiO2 particles is prepared through a rotary coating or pulling method, the film can protect a Si film and a Ag or Al metal film from being affected, the upper conversion material and the lower conversion material contained by the film gather infrared light to be visible light, and reduce ultraviolet light to be visible light and infrared light, the infrared light is then converted into visible light through quantum cutting, the light use efficiency of the Si-film solar cell is largely improved, and quantum cutting can be carried out on long-wavelength infrared light and short-wavelength ultraviolet light which can not be absorbed by the solar cell to convert the long-wavelength infrared light and the short-wavelength ultraviolet light into usable visible light. The conversion efficiency of the solar cell is improved, and decrease of the conversion efficiency and performance degradation of the solar cell caused by temperature rise of the cell are avoided at the same time.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a new method for improving the efficiency of silicon thin-film solar cells by quantum tailoring. Background technique [0002] With the development of social economy, the demand for energy in people's daily life and work is increasing. The use of traditional petrochemical energy is gradually decreasing. At the same time, there are still many areas in the world that cannot receive normal energy supply, and the use of conventional energy can easily damage the ecological environment on the earth. All these prompt researchers to pay more and more attention to the research of new energy. At present, the renewable energy available for people to develop and utilize includes solar energy, wind energy, tidal energy, hydrogen energy, geothermal energy and so on. Solar energy has the characteristics of inexhaustible, inexhaustible, pollution-free and cheap, so it has become the focus of...

AI Technical Summary

Problems solved by technology

2. Energy waste of low-energy photons

Photons with energy lower than the forbidden band width of materials for photovoltaic cells are not enough to excite valence band electrons to transition to the conduction band, which makes long-wavelength photons with wavelengths greater than the intrinsic absorption limit of semiconductors not contribute to photoelectric conversion, resulting in a large amount of light energy loss

3. Energy loss of high energy photons

4. Energy loss caused by recombination of photogenerated electron-hole pairs

The existing technical scheme directly adds the up and down conversion material, which is not conducive to the absorption and formation of a film layer with better quality

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