为了研究三结太阳电池表面的栅线在1 070 nm连续激光辐照过程中的传热影响机制, 文中通过激光辐照过程中三结太阳电池实时的电致发光现象分析三结太阳电池的损伤情况, 并建立三维锗基太阳电池模型, 借助有限元分析软件COMSOL对连续激光辐照锗基太阳电池的温度分布进行仿真。结果表明: 在连续激光功率密度为72.5 W/cm2、辐照时间为41 s时, 三结太阳电池的顶电池出现轻微损伤, 损伤区域首先沿着栅线分布。在锗基太阳电池的仿真模型中, 电池的温度升高至1 318 K, 栅线引起了三结太阳电池热量传递方向的各项异性, 沿着栅线具有更高的热传导速率。仿真结果能够对实验现象给予合理的解释。

Effects of heat transfer on grid lines of triple-junction solar cell irradiated by 1 070 nm CW laser were studied through the damage on triple-junction solar cell irradiated by laser with electroluminescence test. Three-dimensional model based on germanium solar cell was constructed with finite element analysis software COMSOL to simulate temperature distribution on triple-junction solar cell irradiated by CW laser. The results indicate that the top-cell of triple-junction solar cell is slightly damaged at the laser power density 72.5 W/cm2 and continuous irradiation time 41 s and the damaged region is firstly distributed along the grid line. The temperature of germanium solar cell in the simulation model has increased to 1 318 K and the grid lines which has high heat conduction rate result in the anisotropic heat transfer direction. The experimental results are well explained by the simulation model.