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基于载流子辐射(PCR)检测太阳能电池的理论模型,对调制激光致载流子辐射检测中电路状态对频域信号的影响进行了数值仿真分析,得到不同外部电阻下的频域响应幅值曲线;使用所建立的检测实验系统对Si基太阳能电池片进行了检测,对不同电路状态下的幅值图与相位图进行了对比分析,对比不同电路状态下的辐射强度幅值,依据实验所得到的频域响应曲线,拟合计算了载流子的寿命参数。结果表明:PCR技术检测太阳能电池,电路状态为开路时辐射幅值最大,随着外部负载电阻的减小,辐射幅值逐渐较小,相位的变化并不明显,短路时的辐射幅值最小;各电路状态下的拟合寿命相近,载流子辐射检测太阳能电池技术中可以用开路状态的频域检测结果预测其他电路状态的频域响应结果和载流子参数拟合计算方法。
The theoretical model of the solar cell based on carrier radiation (PCR) detection was used to simulate the influence of the circuit state on the frequency domain signal in modulating laser-induced carrier-induced radiation. The response amplitude under different external resistances Curves were obtained. The Si-based solar cells were detected by using the established test system. The amplitude and phase of the Si-based solar cells under different circuit conditions were compared and analyzed. The amplitude of radiation under different circuit conditions was compared. Get the frequency domain response curve, and calculate the lifetime parameter of carrier. The results showed that the detection of solar cells by PCR showed that the radiation amplitude was the largest when the circuit status was open. With the decrease of external load resistance, the radiation amplitude was gradually smaller and the phase change was insignificant and the radiation amplitude was the shortest. The fitting life in each circuit state is similar. In the carrier radiation detection solar cell technology, the frequency domain response results of other circuit states and the carrier parameter fitting calculation method can be predicted by using the open-state frequency domain detection result.