Separation of geminate charge-pairs at donor-acceptor interfaces in disordered solids

被引：256

作者：

Peumans, P ^{[1
]}

Forrest, SR ^{[1
]}

机构：

[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 398卷 / 1-3期

关键词：

D O I：

10.1016/j.cplett.2004.09.030

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using an extension of the Onsager model of exciton dissociation in the bulk of a disordered solid, we determine the separation probability of geminate electron-hole pairs following exciton dissociation by charge-transfer at a donor-acceptor interface. The donor-acceptor interface confines the electron and hole in their respective layers, leading to charge separation with a probability that is significantly higher than predicted by bulk theory. The model explains the surprisingly high carrier collection efficiencies observed in organic donor-acceptor photovoltaic cells, and correctly predicts the voltage-dependence of the photocurrent which differs substantially from that of conventional inorganic semiconductor p-n junctions and may ultimately limit the power conversion efficiency of organic donor-acceptor photovoltaic cells. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：27 / 31

页数：5

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