Research on high-efficiency and new solar cell texturing technology based on ultrafast laser multi-beam parallel processing.
National Natural Science Foundation
With the increasing shortage of non-renewable energy, mainly coal and oil, the problem of "smog" is increasing, and the demand for clean renewable energy is becoming more and more urgent. At present, the crystalline silicon battery accounts for nearly 90% of the solar energy market, and its output is huge. Improving its absorption of solar energy as much as possible has become the main task of the current crystalline silicon solar battery technology upgrade and successful transformation of scientific and technological achievements. At present, the texturing technology of crystalline silicon surface only corresponds to a specific type of microporous structure, which lacks the comparative study of microporous structure types on the surface reflectivity of materials, and the shape of micropores is difficult to accurately control. In this project, the laser rotary cutting method is used to optimize the texturing microstructure of crystalline silicon surface. The finite difference time domain method (FDTD) was used to establish the micro-cell model of crystalline silicon surface, and the effect of texturing microstructure on light absorption was simulated and calculated. The regulation laws of four microstructure types (regular pyramid, inverted pyramid, cylinder and cylinder hole) and geometric characteristics on the surface reflectivity of materials were studied. The ultra-fast laser rotary cutting experiment was carried out to verify the anti-reflection effect of laser rotary cutting. Based on laser direct writing, the influence of laser multi-beam parallel machining on machining quality and efficiency is studied. These research results provide reliable data support and theoretical analysis for analyzing the influence of the three-dimensional morphology of textured microstructure units on the surface reflectivity of materials, and have important reference significance for perfecting the influence mechanism of textured structure on the photoelectric conversion efficiency of solar cells.
