Tvingstedt Kristofer, Vandewal Koen, Gadisa Abay, Zhang Fengling, Manca Jean, Inganäs Olle
Biomolecular and Organic Electronics, Center of Organic Electronics, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden.
J Am Chem Soc. 2009 Aug 26;131(33):11819-24. doi: 10.1021/ja903100p.
In this article we report the weak but omnipresent electroluminescence (EL) from several types of organic polymer:fullerene bulk heterojunction solar cells biased in the forward direction. The light emitted from blends of some commonly used polymers and the fullerene molecule is significantly different from that of any of the pure materials comprising the blend. The lower energy of the blend EL is found to correlate with both the voltage onset of emission and the open-circuit voltage of the photovoltaic cell under solar illumination. We accordingly interpret the emission to originate from interfacial charge transfer state recombination and emphasize EL as a very valuable tool to characterize the charge transfer state present in donor/acceptor organic photovoltaic (OPV) cells.
在本文中，我们报道了几种正向偏置的有机聚合物：富勒烯本体异质结太阳能电池发出的微弱但无处不在的电致发光（EL）。一些常用聚合物与富勒烯分子的共混物发出的光与构成该共混物的任何一种纯材料发出的光都有显著不同。发现共混物EL的较低能量与发射的起始电压以及太阳能照射下光伏电池的开路电压都相关。因此，我们将这种发射解释为源自界面电荷转移态复合，并强调EL是表征供体/受体有机光伏（OPV）电池中存在的电荷转移态的非常有价值的工具。
