Mapping exciton quenching in photovoltaic-applicable polymer blends using time-resolved scanning near-field optical microscopy

被引：13

作者：

Cadby, A. ^{[1
]}

Khalil, G. ^{[1
]}

Fox, A. M. ^{[1
]}

Lidzey, D. G. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.2910826

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have used time-resolved scanning near-field microscopy to image the fluorescence decay lifetime across a phase-separated blend of the photovoltaic-applicable polymers poly(9,9(')-dioctylfluorene-alt-benzothiadiazole) (F8BT) and poly(9,9(')-dioctylfluorene-alt-bis- N,N-'-(4-butylphenyl)-bis-N,N-'-phenyl-1,4-phenylenediamine) (PFB). We show that the efficiency of local fluorescence quenching is composition dependent, with excitons on F8BT molecules being more effectively quenched when F8BT is trapped at a low concentration in a PFB-rich phase. Despite such presumed differences in charge-carrier generation efficiency, our results demonstrate that charge extraction from F8BT:PFB devices is the most dominant mechanism limiting their operational efficiency. (c) 2008 American Institute of Physics.

引用

页数：5

共 27 条

[1] Direct determination of the exciton binding energy of conjugated polymers using a scanning tunneling microscope [J].