Role of Polymer Fractionation in Energetic Losses and Charge Carrier Lifetimes of Polymer: Fullerene Solar Cells
Role of Polymer Fractionation in Energetic Losses and Charge Carrier Lifetimes of Polymer: Fullerene Solar Cells
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DOI：
10.1021/acs.jpcc.5b05709
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发表时间：
2015-08-27
影响因子：
3.7
通讯作者：
Brabec, Christoph J.
中科院分区：
文献类型：
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作者：
Baran, Derya;Vezie, Michelle S.;Brabec, Christoph J.
非辐射复合降低了相对于其理论极限的开路电压，并导致在给定激发下降低的发光发射。因此，可以将发光发射的变化与开路电压和电荷载流子寿命的变化相关联。在这里，我们使用发光的研究结合瞬态光电压和差分充电分析，研究聚合物分馏的影响indacenoedithiophene-co-benzothiadiazole（IDTBT）：富勒烯太阳能电池。在该系统中，聚合物分馏增加了相同注入电流下的电致发光发射并减少了非辐射复合。高分子量和分馏IDTBT聚合物表现出更高的载流子寿命迁移率的产品相比，其nonfractionated类似物，从而改善太阳能电池的性能。
Nonradiative recombination reduces the open-circuit voltage relative to its theoretical limit and leads to reduced luminescence emission at a given excitation. Therefore, it is possible to correlate changes in luminescence emission with changes in open-circuit voltage and in the charge carrier lifetime. Here we use luminescence studies combined with transient photovoltage and differential charging analyses to study the effect of polymer fractionation in indacenoedithiophene-co-benzothiadiazole (IDTBT) :fullerene solar cells. In this system, polymer fractionation increases electroluminescence emission at the same injection current and reduces nonradiative recombination. High-molecular-weight and fractionated IDTBT polymers exhibit higher carrier lifetime-mobility product compared to that of their nonfractionated analogues, resulting in improved solar cell performance.