调制激光激发PN结少数载流子分布及频域响应特性研究

为建立载流子辐射检测Si基太阳能电池的理论模 型,基于太阳能电池非线性耦合方程对调制激光激 励下Si太阳能电池过剩少数载流子的空间分布与频率响应特性进行了仿真分析,对基区、耗 尽层和发射区 的载流子分布与超带宽调制激光的波长、功率密度和调制频率的关系进行了定量研究,通过 仿真结果选定 调制激光的最佳参数范围,进行了载流子辐射频域响应和载流子寿命对频域响应影响的仿 真计算。仿真 结果表明,过剩载流子浓度随扫描频率的增加呈现非线性特征,所用仿真模型对激发参数和 输运参数有较高 的灵敏度。最后对Si基太阳能电池片进行了扫频验证实验,实验结果与仿真结果符合良好, 表明所使用的 仿真方法能够预测载流子辐射技术的检测结果,可用于对调制载流子辐射检测技术仿真和结 果预测。

Minority carrier distribution and frequency domain response characteristic research in p-n junction excitated by modulation laser

Based on the solar cell nonlinear coupled equations,space distribution and frequency response characteristics of excess minority carriers in silicon s olar cell excitated by modulation laser have been studied by simulation analysis in order to build a model for detecting solar cells.The relations between excess carrier distribution in base region,depletion layer,emitter reg ion and super bandwide modulation laser wavelength,power density and the modulation frequency are simu lated.Through the simulation results,the optimal parameter r anges are selected,and the carrier radiation frequency-domain response and the influence of carrier lifetime on fr equency-domain response have been analyzed.The simulation results show that modulation laser parameters have great influence on carrier distribution in silicon solar cells,and the excess carrier concentration increases nonlinearly with the scanning frequency.Finally,veri fication experiment on t he silicon-based solar cell is carried out,and experimental results are in good agreement with the simulation results,which shows that the used simulation method can predict testing results of photocarrier radi ation.