From short to long - Optical and electrical transients in photovoltaic bulk heterojunctions of polyfluorene/fullerenes

被引：14

作者：

Andersson, L. Mattias ^{[1
]}

Inganas, Olle ^{[1
]}

机构：

[1] Linkoping Univ, COE, IFM, S-58183 Linkoping, Sweden

来源：

CHEMICAL PHYSICS | 2009年 / 357卷 / 1-3期

关键词：

Bulk heterojunction; Polymer photovoltaics; CHARGE-TRANSFER EXCITONS; COPOLYMER; RECOMBINATION; DEPENDENCE; MOBILITY;

D O I：

10.1016/j.chemphys.2008.11.011

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：

We combine results from transient optical absorption in a bulk heterojunction polymer donor/fullerene acceptor material, obtained in the optical range as well as in the THz range, with results from electrical transients after a short light pulse, to present a unified interpretation of the transport of charge after the very first act of photoinduced charge transfer. We find that the mobility of charges is initially very high, but dramatically reduced with time, to arrive at values three orders of magnitude lower. We show that this can be understood as a consequence of the transport of hot charges by hopping through the density of states, from higher to lower energies. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：120 / 123

页数：4

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