Acceptor dependent polaron recombination dynamics in poly 3-hexyl thiophene: Fullerene composite films

被引：7

作者：

Busby, Erik ^{[2
]}

Rochester, Christopher W. ^{[1
]}

Moule, Adam J. ^{[1
]}

Larsen, Delmar S. ^{[2
]}

机构：

[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[2] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA

来源：

CHEMICAL PHYSICS LETTERS | 2011年 / 513卷 / 1-3期

基金：

美国能源部;

关键词：

HETEROJUNCTION SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; CHARGE GENERATION; CARRIER TRAPS; BLEND FILMS; TRANSPORT; POLY(3-HEXYLTHIOPHENE); PHOTOEXCITATIONS; CONDUCTIVITY; DISSOCIATION;

D O I：

10.1016/j.cplett.2011.07.066

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：

Recombination in poly-3-hexylthiophene (P3HT) blends with five fullerene acceptors was resolved with temperature-dependent transient absorption spectroscopy. Recombination rates were temperature and acceptor dependent with differing timescales originating from acceptor functionalization and fullerene size. Acceptors with increasing numbers of sidechains (bis > mono > C-60) or decreasing fullerene size (C-60 < C-70 < C-80) exhibit slower recombination. The recombination kinetics was correlated to average distance between the fullerene cage and donor site with functionalized moieties acting as dielectric shields to hinder recombination. Three commonly used differential models were evaluated to describe the data. The quantitative failure of these models suggests a microscopic approach (e. g., Monte-Carlo) is needed to quantitatively model the dynamics. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：77 / 83

页数：7

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