The impact of intermixed donor-acceptor domains in organic bulk heterojunction (BHJ) solar cells, using low-donor-content devices as model systems, is clarified. At low donor contents, the devices are found to exhibit anomalously high open-circuit voltages independent of the donor-acceptor energetics. These observations can be consistently explained by a theoretical model based on optical release of trapped holes, assuming the donors behave as trap sites in the gap of the acceptor. Our findings provide guidelines for reducing the large open-circuit voltage losses in organic solar cells and avoiding morphology-induced losses in state-of-the-art BHJ solar cells and photodetectors.

中文翻译：

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在有机半导体器件中通过陷阱介导的光学释放进行电荷载流子的传输和产生

使用低供体含量的器件作为模型系统，阐明了有机体异质结（BHJ）太阳能电池中混合的供体-受体域的影响。在低供体含量下，发现该装置表现出异常高的开路电压，而与供体-受体能量无关。假设供体在受体间隙中充当陷阱位点，则可以通过基于捕获孔的光学释放的理论模型来一致地解释这些观察结果。我们的发现为减少有机太阳能电池中的大开路电压损耗以及避免最新的BHJ太阳能电池和光电探测器中由形态引起的损耗提供了指导。