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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Quantitative Analyses of Competing Photocurrent Generation Mechanisms in Fullerene-Based Organic Photovoltaics
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Quantitative Analyses of Competing Photocurrent Generation Mechanisms in Fullerene-Based Organic Photovoltaics

机译：基于富勒烯的有机光伏中竞争性光电流产生机理的定量分析

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摘要

The performance of fullerene-based organic photovoltaic devices (OPVs) with low donor concentrations is not limited by the trade-off between short-circuit current density (J(sc)) and open -circuit voltage (V-oc), unlike bulk heterojunction OPVs. While the high Voc in this novel type of OPVs has been studied, here we investigate the mechanisms that govern J(sc), which are not well understood. Three mechanisms, diffusion limited exciton relaxation, geminate recombination during exciton dissociation, and non-geminate recombination during charge transport, are studied analytically by combining various experimental techniques and transfer matrix simulation. We find that exciton dissociation at donor/acceptor interfaces is the dominant factor to produce high J(sc), and at low P3HT concentrations exciton relaxation limits photocurrent generation. With more P3HT inclusion, the creation of interfaces promotes exciton dissocation but also reduces fullerene crystallinity, weakening the driving force for charge separation, and introduces nongeminate recombination sites. Quantitative analyses show that the magnitude of measured Le and the donor concentration dependence are well accounted for by these three competing mechanisms.
机译：与体异质结不同，低施主浓度的基于富勒烯的有机光伏器件（OPV）的性能不受短路电流密度（J（sc））和开路电压（V-oc）之间的权衡限制OPV。虽然已经研究了这种新颖类型的OPV中的高Voc，但在这里我们研究了控制J（sc）的机制，目前尚不清楚。通过结合各种实验技术和传递矩阵模拟，分析性地研究了扩散受限的激子弛豫，激子解离过程中的基团重组和电荷传输过程中的非基团重组这三种机理。我们发现，在供体/受体界面处的激子解离是产生高J（sc）的主要因素，在低P3HT浓度下，激子弛豫限制了光电流的产生。随着更多的P3HT夹杂物的出现，界面的形成促进了激子的离解，但同时也降低了富勒烯的结晶度，削弱了电荷分离的驱动力，并引入了非对位的重组位点。定量分析表明，这三种竞争机制很好地说明了测得的Le的大小和供体浓度的依赖性。

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