为了研究808 nm连续激光供能对单结GaAs光电池输出性能的影响, 利用COMSOL和MATLAB软件构建了相应物理模型, 通过数值仿真研究了激光功率密度、等效串并联电阻和减反膜对热稳态时光电池伏安特性、开路电压、短路电流、光电转换效率、填充因子和稳态工作温度的影响。结果表明: 随着激光功率密度增大, 开路电压和短路电流不断增大, 且转换效率和填充因子都具有最大值; 减小等效串联电阻和增大等效并联电阻是提高光电池输出性能的有效方法; 减反膜结构对提高光电池转换效率非常重要, 但也使光电池热稳态工作温度较高。当入射功率密度为62.4 mW/cm2时, 光电池热稳态输出效率达到最高为50.13%。该数值模拟结果与相关实验结果基本相符, 对连续激光供能光电池输出特性研究提供一定的理论依据。

In order to study the effects of single-junction GaAs photovoltaic cell irradiated by 808 nm continuous wave laser, a physical model was established by software COMSOL and MATLAB. The voltage-current characteristics, open circuit voltage, short circuit current, photoelectric conversion efficiency, fill factor and heat steady temperature of cell were simulated, and the influence of the power densities, equivalent series, parallel resistance and antireflection coating were also discussed. The results shows that open circuit voltage and short circuit current increases with the increase of laser power density, while conversion efficiency and fill factor have maximum value. Reducing equivalent series resistance and increasing equivalent parallel resistance are an effective method to improve the output performance of cell. It was significant to improve the efficiency of cell with adding antireflection coating, however making the cell temperature higher at heat steady. The conversion efficiency of cell reaches to maximum value of 50.13% under 62.4 mW/cm2 at heat steady. The simulation result is basically consistent with relevant experiments, which can provide theoretical reference for output characteristics study of photovoltaic cell by continuous wave laser irradiation at some extent.