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首页> 外文期刊>Photovoltaics, IEEE Journal of >Optimizing CdTe Solar Cell Performance: Impact of Variations in Minority-Carrier Lifetime and Carrier Density Profile
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Optimizing CdTe Solar Cell Performance: Impact of Variations in Minority-Carrier Lifetime and Carrier Density Profile

机译：优化CdTe太阳能电池的性能：少数载流子寿命和载流子密度分布变化的影响

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摘要

Using numerical simulations, we study the combined effects of nonuniform minority-carrier lifetime $tau$ and carrier density $N_A$ on device performance. In a uniformly doped device, maximum open-circuit voltage $V_{rm oc}$ is obtained for high $tau$ and high $N_A$. The fill-factor (FF) is mainly dependent on the lifetime. When the lifetime is low, and $N_A$ is high, the FF suffers losses due to voltage-dependant carrier collection. For a low carrier density and low lifetime, the electric field strength is low, recombination is a competitive process to drift, and the FF is reduced. Simulations predict that it might be possible to increase the device efficiency with lower carrier density, if the back of the absorber is highly doped. This configuration increases the built-in potential and the electric field close to the junction region, while keeping the space-charge region wide. In addition, a device with such a profile is very tolerant toward lifetime variations of the highly doped layer. With our simulation parameters, when the absorber properties are uniform, efficiencies >18% require experimentally unrealistic doping and lifetime values. If the back of the absorber is doped significantly higher than the rest, such efficiencies can be achieved with realistic values of doping and lifetime.
机译：使用数值模拟，我们研究了不均匀的少数载流子寿命 $ tau $ 和载流子密度 $ N_A $ 公式>关于设备性能。在均匀掺杂的设备中，对于高 $ tau $ <>可获得最大开路电压 $ V_ {rm oc} $ / formula>和高 $ N_A $ 。填充因子（FF）主要取决于寿命。当寿命低并且 $ N_A $ 高时，由于电压依赖的载流子收集，FF遭受损失。对于低载流子密度和低寿命，电场强度低，复合是竞争性的漂移过程，并且减小了FF。仿真预测，如果吸收体的背面高度掺杂，则可能以较低的载流子密度提高器件效率。这种配置增加了内在电势和靠近结区的电场，同时保持空间电荷区宽。另外，具有这种轮廓的器件对于高掺杂层的寿命变化非常容忍。利用我们的仿真参数，当吸收体性能均匀时，效率> 18％要求实验上不现实的掺杂和寿命值。如果吸收体的背面掺杂得比其余部分高得多，那么可以通过掺杂和寿命的实际值实现这种效率。

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