Mihailetchi V D, Koster L J A, Hummelen J C, Blom P W M
Molecular Electronics, Materials Science CentrePlus, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.
Phys Rev Lett. 2004 Nov 19;93(21):216601. doi: 10.1103/PhysRevLett.93.216601. Epub 2004 Nov 16.
The photocurrent in conjugated polymer-fullerene blends is dominated by the dissociation efficiency of bound electron-hole pairs at the donor-acceptor interface. A model based on Onsager's theory of geminate charge recombination explains the observed field and temperature dependence of the photocurrent in PPV:PCBM blends. At room temperature only 60% of the generated bound electron-hole pairs are dissociated and contribute to the short-circuit current, which is a major loss mechanism in photovoltaic devices based on this material system.
共轭聚合物-富勒烯共混物中的光电流由供体-受体界面处束缚电子-空穴对的解离效率主导。基于翁萨格双生电荷复合理论的模型解释了在聚对苯撑乙烯：苯基-C61-丁酸甲酯（PPV:PCBM）共混物中观察到的光电流的场和温度依赖性。在室温下，仅60%的产生的束缚电子-空穴对发生解离并对短路电流有贡献，这是基于该材料体系的光伏器件中的一种主要损耗机制。
