Experimental study about effect of 1070nm CW laser irradiation on three-junction GaAs solar cells
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摘要: 为了研究真空环境下波长为1070nm连续激光辐照对三结砷化镓太阳电池输出的影响，采用实验研究的方法测量了不同功率密度激光作用下太阳电池背面温度和负载电压的实时变化。当激光功率密度为8.4W/cm2时，温度升高显著，负载电压下降趋近于零，激光作用结束，电压恢复至初始电压的53%;继续增大激光功率密度至11.7W/cm2，经2.3s后，负载电压降为零且不能恢复，电池已毁伤。结果表明，连续激光作用会引起电池温升，温度升高使负载电压下降; 作用激光功率密度较小时，电池温升幅度较小，负载电压下降幅度也较小，激光停止后，负载电压能逐渐恢复至初始状态; 作用激光功率密度较大时，温升幅度也较大，引起负载电压下降显著，即使激光停止作用，负载电压也不能恢复至初值，此时说明电池已有损伤。该实验结果可以在一定程度上为激光损伤电池机理的研究提供参考依据。Abstract: In order to study effect of 1070nm continuous wave (CW) laser irradiation on three-junction GaAs solar cells, rear surface temperature and load voltage of a solar cell under different power densities were measured. Under 8.4W/cm2 laser irradiation, the temperature increased obviously and load voltage decreased nearly to zero. The load voltage only recovered to 53% of the initial value after irradiation. With the increasing of power density to 11.7W/cm2, the load voltage decreased to zero after 2.3s. Furthermore, the cell was damaged and can't be recovered. The results show that the temperature of a solar cell rises significantly and the load voltage deceases when irradiated by CW laser. When laser power density is small, the rise of cell temperature is small and the drop of load voltage is also small. The load voltage can be restored to the initial state with the stop of laser irradiation. When laser power density is large, the rise of cell temperature is large and load voltage decreases significantly. Even with the stop of laser, the load voltage can not be restored to the initial value and the cell is damaged. The experiment results can provide reference basis for the research of damage mechanism of solar cells under laser irradiation.
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Keywords:
- laser technique /
- continuous wave laser /
- vacuum /
- three-junction GaAs /
- temperature /
- load voltage
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Figure 1. Experimental system of a three-junction GaAs solar cell irradiated by CW laser
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Figure 2. Temperature and load voltage curves of a three-junction GaAs solar cell under laser irradiation
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Figure 3. Temperature changing curves of a three-junction GaAs solar cell under different laser power densities
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