Exciton dynamics in alternating polyfluorene/fullerene blends

被引：27

作者：

De, Swati ^{[1
]}

Kesti, Tero ^{[1
]}

Maiti, Manisankar ^{[1
]}

Zhang, Fengling ^{[2
]}

Inganas, Olle ^{[2
]}

Yartsev, Arkady ^{[1
]}

Pascher, Torbjorn ^{[1
]}

Sundstrom, Villy ^{[1
]}

机构：

[1] Lund Univ, Kemictr, SE-22100 Lund, Sweden

[2] Linkoping Univ, Dept Phys IFM, S-58183 Linkoping, Sweden

来源：

CHEMICAL PHYSICS | 2008年 / 350卷 / 1-3期

关键词：

exciton dynamics; polyfluorene/fullerene blends;

D O I：

10.1016/j.chemphys.2007.11.018

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：

Exciton dynamics in alternating copolymer/fullerene solar cell blends have been investigated using femtosecond transient absorption spectroscopy. The acceptor concentrations have been varied over a wide range. Experimental data, kinetic modeling and simulations, all indicate that the efficiency of exciton conversion to charges is 100% even at acceptor concentrations as low as 20 wt%. The reported dependence of solar cell efficiency on fullerene concentration may thus arise from other factors. However, there exists an acceptor concentration threshold (5 wt%) below which a substantial fraction of the excitations remain unquenched. The results, we believe are very relevant to optimization of performance efficiency by clever manipulation of morphology. We have also observed exciton-exciton energy transfer in these blends at low acceptor concentrations. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：14 / 22

页数：9

共 35 条

[1] Why is exciton dissociation so efficient at the interface between a conjugated polymer and an electron acceptor? [J].