期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 358, 期 17, 页码 2508-2511出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2011.12.036
关键词
Exciton; Dissociation; Bulk heterojunction solar cell
Experimental studies evidence that excitons in organic materials can efficiently dissociate into free electrons and holes at an intrinsic donor/acceptor interface despite the strong Coulomb attraction between the charges provided by the low dielectric constant in organics. Using a semi-analytic theory for the dissociation probability of electron-hole pairs we show that although delocalization of charge carriers along the polymer chains can help the carriers to overcome the Coulomb potential barrier, this effect is not enough to explain the efficient and field-independent dissociation of pairs at the interfaces. Furthermore we study the influence of the dipole layer built in the dark at the donor/acceptor interface considering two distinct forms of this dipole layer: a continuous layer and a system of discrete dipoles. In the latter case very high dissociation probabilities can be reached. The main effect here is provided by the quantization energy of holes restrained by the adjacent dipoles. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据