Charge-transfer complexes of conjugated polymers as intermediates in charge photogeneration for organic photovoltaics

被引：38

作者：

Bakulin, Artem A. ^{[1
]}

Martyanov, Dmitry ^{[2
,3
]}

Paraschuk, Dmitry Yu. ^{[2
,3
]}

van Loosdrecht, Paul H. M. ^{[1
]}

Pshenichnikov, Maxim S. ^{[1
]}

机构：

[1] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands

[2] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

[3] RAS, PN Lebedev Phys Inst, Moscow 119991, Russia

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 482卷 / 1-3期

关键词：

EXCITON DISSOCIATION; ELECTRON-TRANSFER; BLEND FILMS; EFFICIENT; DYNAMICS;

D O I：

10.1016/j.cplett.2009.09.052

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：

Ultrafast visible-pump/IR-probe spectroscopy is applied to study the wavelength dependence of charge photogeneration in materials based on donor-acceptor charge-transfer complexes (CTCs) of the conjugated polymer MEH-PPV. In binary polymer-acceptor blends, photoexcitation in the absorption band of either CTC or polymer results in similar dynamics of the charge-associated transient absorption. Likewise, in polymer/CTC-acceptor/fullerene ternary blends, where charge separation occurs via a two-step pathway, the photophysics is also independent of excitation wavelength. These similarities in charge dynamics indicate that CTC excited states serve as an intermediate for charge photogeneration. The conclusions of the ultrafast study are supported by photocurrent spectroscopy. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：99 / 104

页数：6

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