Reduced exciton binding energy in organic semiconductors: Tailoring the Coulomb interaction

被引：19

作者：

Engel, Miriam ^{[1
,2
]}

Kunze, Frederik ^{[1
,2
]}

Lupascu, Doru C. ^{[3
]}

Benson, Niels ^{[1
,2
]}

Schmechel, Roland ^{[1
,2
]}

机构：

[1] Univ Duisburg Essen, Fac Engn, NST, D-47057 Duisburg, Germany

[2] Univ Duisburg Essen, Fac Engn, CeNIDE, D-47057 Duisburg, Germany

[3] Univ Duisburg Essen, Fac Engn, Inst Mat Sci, D-45141 Essen, Germany

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2012年 / 6卷 / 02期

关键词：

organic semiconductors; excitons; organic solar cells; Coulomb interaction;

D O I：

10.1002/pssr.201105488

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For organic photovoltaics (OPV) the maximum in obtainable power conversion efficiency is limited by a low semiconductor permittivity and the resulting enhanced Coulomb interaction (CI). This, however, is an aspect rarely addressed in the OPV development. Here, a concept is introduced which allows a reduced CI in organic semiconductors. This is the result of a device structure, which upon exciton formation forces part of the electric field between complementary charges through a high-k material, resulting in partial field screening and as such a reduced CI. The feasibility of this concept is substantiated by an investigation on the exciton separation efficiency in pentacene devices. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：68 / 70

页数：3

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