电致发光
光伏系统
化学
有机太阳能电池
富勒烯
聚合物太阳能电池
聚合物
光电子学
接受者
异质结
混合太阳能电池
电荷(物理)
开路电压
光化学
电压
化学物理
材料科学
物理
有机化学
凝聚态物理
电气工程
图层(电子)
量子力学
工程类
作者
Kristofer Tvingstedt,Koen Vandewal,Abay Gadisa,Fengling Zhang,Jean Manca,Olle Inganäs
摘要
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.
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