光学微腔型a-Si薄膜电池陷光结构设计

先基于频域有限差分法和a-Si材料的有效吸收波长范围,利用光场分布、通光效率和有源层吸收谱等优化了有源层厚度为300 nm的a-Si电池用光学微腔陷光结构的缓冲层厚度和光学微腔通光孔尺寸,并对电池光电流密度谱、总电流密度和电池输出参数进行了计算分析.研究表明:缓冲层厚度为2.6 μm,通光孔直径Φ=D×0.8/8时,电池有源层具有最大的吸收效率;优化电池的短路电流为25.9225 mA/cm2,优于其它陷光结构获得的短路电流.

Design of Light-Trapping Structure for a-Si Thin Film Solar Cell with Optical Microcavity

Based on the Finite-Difference Frequency-Domain(FDFD) method and the range of effective absorption wavelength, the thickness of buffer layer and the size of optical microcavity clear aperture of optical microcavity light-trapping structure in a-Si solar cell that the thickness of active layer is 300 nm are optimized by using light field distribution, light throughput and active layer absorption spectra, and the photocurrent density spectrum, the total current density and the output parameter are analyzed.The results show that the active layer has a maximum absorption efficiency when the thickness of the buffer layer is 2.6 μm and the clear aperture diameter Φ=D×0.8/8;The short-circuit current of the optimized cell is 25.9225 mA/cm2, which is better than that obtained by other light-trapping structures.