Photoinduced electron transfer in conjugated polymer/fullerene heterostructures

被引：14

作者：

Haugeneder, A ^{[1
]}

Kallinger, C ^{[1
]}

Spirkl, W ^{[1
]}

Lemmer, U ^{[1
]}

Feldmann, J ^{[1
]}

Scherf, U ^{[1
]}

Harth, E ^{[1
]}

Gugel, A ^{[1
]}

Mullen, K ^{[1
]}

机构：

[1] Univ Munich, Sekt Phys, D-80799 Munich, Germany

来源：

FULLERENES AND PHOTONICS IV | 1997年 / 3142卷

关键词：

conjugated polymer; fullerene; diffusion; self-assembly; dissociation; photoluminescence; photoinduced electron transfer;

D O I：

10.1117/12.293355

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 investigate the photophysics in composite systems consisting of fullerene molecules and a conjugated polymer. Photoluminescence (PL) quenching experiments are used to study the photoinduced electron transfer that occurs after photoexcitation of the conjugated polymer. In blend systems with various fullerene concentrations we find a strong concentration dependent PL-quenching. By doping a ladder type poly(p-phenylene) (LPPP) with 5 weight % of a C-60-fullerene the polymer PL is quenched by more than one order of magnitude. Time-resolved measurements show that the photoinduced electron transfer can not be described by a single rate. The nonexponential PL-decay is due to a complex interplay between the diffusion of neutral excitations and their dissociation and recombination. In order to study these processes in more detail we have prepared well defined heterostructures comprising a self-assembled fullerene monolayer and a thin spin-coated polymer layer. From PL-quenching experiments on these samples we infer a value of 14 nm for the diffusion length of neutral excitations in LPPP.

引用

页码：140 / 147

页数：8