具有渐变带隙CZTSSe层的高效薄膜太阳能电池
Towards highly efficient thin-film solar cells with a graded-bandgap CZTSSe layer
摘要：
一个耦合的光电模型与差分进化算法一起实现，以评估CZTSSe层的带隙分级的功效，以提高薄膜CZTSSe太阳能电池的功率转换效率。线性和正弦渐变的带隙进行了检查，与钼背反射器的太阳能电池是平面或周期性波纹。尽管最佳渐变带隙可以显著地提高效率，但是周期性地使背反射器起皱的效果充其量是适度的。一个870 nm厚的CZTSSe层的正弦渐变预测的效率为21.74%，相比实验实现的2200 nm厚的均匀CZTSSe层的效率为12.6%。窄带隙区域中的高电子空穴对产生速率和由于靠近CZTSSe层的正面和背面的较宽带隙而导致的高开路电压是效率高增强的原因。
英文摘要：
A coupled optoelectronic model was implemented along with the differential evolution algorithm to assess the efficacy of grading the bandgap of the CZTSSe layer for enhancing the power conversion efficiency of thin-film CZTSSe solar cells. Both linearly and sinusoidally graded bandgaps were examined, with the molybdenum backreflector in the solar cell being either planar or periodically corrugated. Whereas an optimally graded bandgap can dramatically enhance the efficiency, the effect of periodically corrugating the backreflector is modest at best. An efficiency of 21.74% is predicted with sinusoidal grading of a 870-nm-thick CZTSSe layer, in comparison to 12.6% efficiency achieved experimentally with a 2200-nm-thick homogeneous CZTSSe layer. High electron-hole-pair generation rates in the narrow-bandgap regions and a high open-circuit voltage due to a wider bandgap close to the front and rear faces of the CZTSSe layer are responsible for the high enhancement of efficiency.
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