为了研究真空环境下1070nm连续激光辐照对三结GaAs太阳电池输出性能的影响,利用COMSOL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、光斑半径、减反膜和热辐射热对流对温度场的影响。结果表明,吸收系数、热导率和光电转换效率是温度演变的3个主要因素; 温升幅度随激光功率密度增大而增大; 光斑半径越小使得电池表面温差越大; 拥有减反膜结构可有效地提高太阳电池转换效率,但也使电池温度较高; 热对流散热在电池较低温度 (300K~400K)情况下占据主导作用;当入射功率密度为16.7W/cm2、光斑半径与电池半径相同时,经20s后,电池中心温度达到501.521K,导致光电转换效率为0。该数值模拟结果与实验结果基本相符,对激光损伤太阳电池机理研究提供一定的理论依据。

In order to study the effects of 1070nm continuous wave laser irradiation on output performance of three-junction GaAs solar cell, a physical model was established by software COMSOL. The influence of laser power density, spot radius, anti reflection film, thermal radiation and thermal convection on temperature field were studied by numerical simulation. The results show that, absorption coefficient, thermal conductivity and photoelectric conversion efficiency are three main factors of temperature evolution. The magnitude of temperature increases with the increasing of laser power density. The smaller the spot radius is, the greater the temperature difference of cell surface. The conversion efficiency of solar cells can be effectively improved by anti reflection film structure, but it also makes battery temperature higher. Thermal convection dominates under the lower temperature (300K~400K) of the battery. When the incident power density is 16.7W/cm2 and spot radius is the same as the cell radius, after 20s, the central temperature of battery can reach 501.521K and lead to photoelectric conversion efficiency of 0. The numerical simulation results are in good agreement with the experimental results. The study provides a theoretical basis for the research of the mechanism of laser damage solar cells.