Femtosecond spectroscopic studies of photoinduced electron transfer in MDMO-PPV:ZnO hybrid bulk heterojunctions

被引：4

作者：

Cecchetto, E.

Slooff, L. H.

de Cola, L.

Zhang, H.

机构：

[1] Univ Amsterdam, Vant Hoff Inst Mol Sci, NL-1018 WS Amsterdam, Netherlands

[2] Univ Munster, Inst Phys, D-48149 Munster, Germany

[3] ECN Solar Energy, NL-1755 ZG Petten, Netherlands

来源：

JOURNAL OF LUMINESCENCE | 2007年 / 122卷

关键词：

ultrafast dynamics; photophysics of polymers; spectroscopy; excited state dynamics of molecules; electron transfer;

D O I：

10.1016/j.jlumin.2006.01.189

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The photophysics of charge carriers (polaron) in MDMO-PPV:ZnO hybrid bulk heterojunction is studied at 80 K by femtosecond transient absorption spectroscopy. A short-lived positive polaron is observed in the blend phase in MDMO-PPV:ZnO blend films with a weight ratio of 1:1 and 1:2. Further increase of ZnO weight ratio results in a significant quenching of the polaron absorption. The results are discussed in the concept that both pristine polymer and MDMO-PPV:ZnO blend phases coexist in the blend films. It is concluded that a polaron is photogenerated within the excitation laser pulse (< 100 fs) and electron transfer efficiency is highest in blend films 1:1 and 1:2. Lack of the interfacial area and faster back electron transfer process are discussed to be responsible for the quenching of the electron transfer efficiency in blend film 1:3. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：546 / 548

页数：3

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