Insights into efficiency deviation from current-mismatch for tandem photovoltaics

光电流 串联 材料科学 电流(流体) 光电子学 光伏 电压 能量转换效率 光电效应 光伏系统 电气工程 工程类 复合材料
作者
Yining Bao,Tianshu Ma,Zhenhai Ai,Yuqi Zhang,Luolei Shi,Linling Qin,Zhenhai Yang,Guoyang Cao,Changlei Wang,Xiaofeng Li
出处
期刊:Nano Energy [Elsevier BV]
卷期号:120: 109165-109165 被引量:5
标识
DOI:10.1016/j.nanoen.2023.109165
摘要

For tandem solar cells (TSCs), the highest efficiency is generally believed to occur when the top and bottom sub-cells obtain an identical photocurrent, i.e., the current-match condition. However, the real situation is that there is a slight deviation from the matching point, which is an interesting phenomenon, but lacks a clear explanation. Here, we report a coupled photoelectric investigation on the intrinsic mechanisms within TSCs under various current configurations. Taking an all-perovskite TSC as an example, we find that the efficiency deviation originates from the current reduction and fill factor (FF) compensation; moreover, the optimal efficiency depends primarily on the sub-cells with higher FF. Our analysis further reveals that the higher FF and efficiency are achieved under current-mismatch condition due to the differentiated voltage assignments among the sub-cells, i.e., the sub-cells with higher currents require larger voltages in order to effectively recombine the surplus currents. We also find that the impact of sub-cell leakage on TSC performance can be partially alleviated by increasing the current of the affected sub-cell. Such an optoelectronic insight offers a valuable guidance for designing high-efficiency TSCs.
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