论文标题
朝着高效的薄膜太阳能电池，带有分级带gap cztsse层
Towards highly efficient thin-film solar cells with a graded-bandgap CZTSSe layer
论文作者
论文摘要
与差分进化算法一起实现了耦合的光电模型，以评估对CZTSSE层的带隙进行分级以提高薄膜CZTSSE太阳能电池的功率转换效率的功效。对线性和正弦级的带镜进行了线性和正弦式的带镜，太阳能电池中的钼反射器是平面或定期瓦楞纸。尽管最佳分级的带隙可以显着提高效率，但定期瓦楞纸反射器的效果充其量是适中的。通过效率为870 nm厚的CZTSSE层，效率为21.74％，相比之下，效率为12.6％，效率为2200 nm厚的均匀均匀的CZTSSE层实验。窄带区域中的高电子孔对生成速率以及靠近CZTSSE层前和后面的更宽带隙导致的高开路电压是高效率的高效率。
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.
