Understanding tandem organic photovoltaic cell performance

被引:17
作者
Lassiter, Brian E. [1 ]
Renshaw, C. Kyle [2 ]
Forrest, Stephen R. [1 ,2 ,3 ]
机构
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA
关键词
SOLAR-CELLS; CONVERSION EFFICIENCY; BULK; NANOCLUSTERS;
D O I
10.1063/1.4807910
中图分类号
O59 [应用物理学];
学科分类号
摘要
We develop a framework to understand the performance of tandem organic photovoltaic (OPV) cells consisting of a series-connected stack of an arbitrary number of sub-cells. The power conversion efficiency penalty, Delta(n), is defined as the loss incurred when the tandem cell is at its maximum power point (MPP) but one or more sub-cells are not operating at their individual MPPs. To minimize Delta(n), the current at the MPP for each sub-cell must be equal. We also develop a method to calculate the tandem cell spectral mismatch factor and fill factor, showing that they are related to both the fill factors and short circuit currents of all the constituent sub-cells. By including the current generated in the dark, exciton dissociation at the donor-acceptor heterojunction, and photoconductivity, along with current losses due to polaron-pair and bimolecular recombination, we simulate the operation of small molecule bilayer and mixed-layer sub-cells used in the tandem, and from these results derive the behavior of the integrated device. This analysis is used to understand and optimize tandem OPV cell performance. (C) 2013 AIP Publishing LLC.
引用
收藏
页数:7
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