连续激光辐照三结GaAs太阳电池热应力场研究

为了研究1070nm光纤连续激光对三结GaAs太阳电池的热力作用,使用COMSOL软件建立物理模型进行了数值仿真,得到了不同激光功率密度激光作用下的热应力场。为了验证了热应力计算方法的正确性,利用栅线投影法测量了功率为16.7W、辐照半径为1mm、辐照时间为10s的激光作用下电池表面的形变,实验结果与模拟结果基本吻合。结果表明,辐照半径为1.5cm、功率密度为16.7W/cm 2的激光辐照20s时,底电池中心温度刚好超过电池使用温度;底电池中心等效应力为96.6MPa,刚好超过底电池材料的屈服极限;根据这一结果可推测电池失效与热应力导致的结构损伤有关。该数值模拟结果与实验结果为激光辐照太阳电池的热力效应研究提供了一定的理论依据。

Study on three-junction GaAs solar cell thermal stress field by continuous wave laser irradiation

In order to study thermodynamic effect of 1070nm continwous wave fiber laser on three-junction GaAs solar cells, physical model was built by COMSOL software and numerical simulation was carried out. Thermal stress fields under different laser power densities were obtained. In order to verify the correctness of thermal stress calculation method, surface deformation of batteries under laser irradiation with power of 16.7W, irradiation radius of 1mm and irradiation time of 10s was measured by grating projection method. The simulation results show that, when irradiation radius is 1.5cm and power density is 16.7W/cm2, laser irradiation time is 20s, central temperature of bottom battery is just above service temperature of the battery. Equivalent stress in the center of bottom battery is 96.6MPa. It just exceeds the yield limit of bottom battery material. According to this result, it can be inferred that the failure of battery is related to the structural damage caused by thermal stress. The experimental results are in good agreement with the simulation results. The numerical simulation results and experimental results provide theoretical basis for the study of thermal effects of laser irradiated solar cells.