Preparation method of nanometer silicon quantum dots and application thereof in film solar batteries

Abstract

The invention aims at providing a preparation method of nanometer silicon quantum dots and application of the method in the manufacture of film solar batteries. The invention uses a PECVD method for growing amorphous silicon, and adopts double light beams for scanning the crystalline amorphous silicon films layer by layer, i.e. the double-light-beam interference of two beams of femtosecond lasers with the polarization state of round polarization state is used for forming nanometer crystalline silicon in amorphous lattices, and the scanning on the amorphous silicon by the double beams of the femtosecond lasers layer by layer utilizes the movement of a three-dimensional sample table. First, the femtosecond laser is gathered at a point in the sample, and the laser carries out plane scanning on the samples in the depth of the sample in a way of moving scanning line by line. After the scanning of the layer is completed, the sample table is moved up, and the laser is gathered on an upper plane again for scanning. Through regulating and controlling the laser power, the pulse width, the repeating frequency and the scanning speed, nanometer silicon arrays with the size distribution of the crystal grains in a range from 30 to 50 nm and the crystal grain space controlled between 20 and 40 nm are formed in the amorphous silicon lattices, the nanometer silicon quantum dot layer can be used for manufacturing silicon base film batteries, and the battery conversation efficiency can be improved.

Description

technical field [0001] The invention relates to a method for preparing nano-silicon quantum dots and its application in the preparation of thin-film batteries, in particular to scanning crystallized amorphous silicon films with femtosecond double-beam lasers to form nano-crystalline silicon arrays. The invention belongs to the technical fields of nanometer material preparation and solar cell preparation. Background technique [0002] With the development of human civilization, the energy consumption has also increased, and the development and utilization of new energy sources is now a top priority. Of particular interest in the development of alternative energy sources are solar cells that convert directly from solar energy into electricity. Conventional solar cells currently on the market are mainly first-generation solar cells based on crystalline silicon, and the market share of second-generation solar cells based on amorphous silicon and polycrystalline compound semicon...

AI Technical Summary

Problems solved by technology

[0004] However, the efficiency of nano-silicon or microcrystalline silicon thin-film solar cells reported so far has not been greatly improved compared with amorphous silicon thin-film solar cells.

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