Microstructure light trapping method for silicon-based thin film solar cell

Abstract

The invention relates to a microstructure light trapping method for a silicon-based thin film solar cell. A micrometer-scale periodic structure is used as a light trapping part of the cell, or the micrometer-scale periodic structure and a textured structure form the light trapping part of the cell. The light trapping structure is prepared on a substrate material, and the thin film solar cell can be directly deposited on the light trapping substrate, and can be covered by light trapping sheet glass, so that the light trapping capability of the cell can be effectively improved, the photo absorption can be improved, and the photoelectric conversion efficiency of the thin film solar cell can be improved. Photoelectric efficiency tests show that the relative efficiency of a double-junction amorphous silicon / microcrystalline silicone cell can be improved by 9.95 percent by the light trapping technology. The microstructure light trapping method is compatible with a conventional thin film cell preparation technology, and is suitable for large-area batch production, and the efficiency of the thin film solar cell can be effectively improved under the condition of no changes in process parameters.

Description

technical field [0001] The invention relates to the fields of micro-nano processing, energy technology and optoelectronic devices, in particular to a silicon-based thin-film solar cell light-trapping technology. Background technique [0002] Entering the 21st century, with the rapid development of the global economy, human demand for energy continues to increase, and traditional fossil energy is increasingly exhausted. At the same time, the large amount of waste gas produced by fossil energy is deteriorating our living environment. In order to deal with the energy crisis and environmental pollution, it is necessary to develop and utilize renewable, clean and pollution-free new energy, and follow the path of sustainable development to ensure a stable and lasting energy supply for human beings. The sun radiates energy continuously through the fusion of hydrogen nuclei. The energy irradiated to the earth every second is equivalent to the heat produced by burning 5 million tons...

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Problems solved by technology

[0007] An invention patent previously applied by the applicant: "Preparation and application of light-trapping structural glass for thin-film solar cells", application number: 201310039891.7, application date: 2013-02-01, the invention discloses a light-trapping The preparation process of the glass sheet, and it is proposed that the thin-film battery can be deposited on the light-trapping surface of the light-trapping glass sheet, but there are two shortcomings in depositing the battery on the light-trapping surface: first, the traditional thin-film battery is deposited on the flat surface Structurally, it is necessary to re-explore the process parameters for the deposition of cells; secondly, due to the existence of the light-trapping structure, the deposited thin film layer is easy to pierce and become a waste product, resulting in a decrease in production efficiency

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