Long-lived photoinduced charges in donor-acceptor anthraquinone-substituted thiophene copolymers

被引:28
作者
Luzzati, S
Scharber, M
Catellani, M
Giacalone, F
Segura, JL
Martin, N
Neugebauer, H
Sariciftci, NS
机构
[1] CNR, Ist Studio Macromol, I-20133 Milan, Italy
[2] Johannes Kepler Univ Linz, Linz Inst Organ Solar Cells Phys Chem, A-4040 Linz, Austria
[3] Univ Complutense, Dept Quim Organ, E-28040 Madrid, Spain
关键词
D O I
10.1021/jp056483g
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
The photoinduced charge-transfer properties of a series of polyalkylthiophene copolymers, carrying anthraquinone substituents covalently linked to the conjugated backbone, have been studied in the solid state by photoinduced absorption (PA) and light-induced electron spin resonance (LESR) spectroscopy. The measurements indicate the formation of metastable charges arising from the photoinduced electron transfer from the polythiophene backbone to the anthraquinone moieties. At low temperatures (below 200 K), long-lived persistent charges are formed, exhibiting lifetimes that extend for several minutes; their recombination kinetics has been studied by following the formation and decay of the PA and LESR signals. The results are rationalized using a model originally proposed to describe the low-temperature recombination kinetics of long-lived photoexcited carriers in amorphous inorganic semiconductors. It is clearly evidenced that, in these polymers, the number of acceptor substituents in the chain, easily tuned by chemical tailoring, plays a key role in the photoexcitation scenario.
引用
收藏
页码:5351 / 5358
页数:8
相关论文
共 36 条
[11]   Dispersive nonlinear dynamics of photoexcitations in π-conjugated polymers [J].
Ehrenfreund, E ;
Epshtein, O ;
Eichen, Y ;
Wohlgenannt, M ;
Vardeny, ZV .
SYNTHETIC METALS, 2003, 137 (1-3) :1363-1365
[12]   Dispersive dynamics of photoexcitations in conjugated polymers measured by photomodulation spectroscopy [J].
Epshtein, O ;
Nakhmanovich, G ;
Eichen, Y ;
Ehrenfreund, E .
PHYSICAL REVIEW B, 2001, 63 (12)
[13]   Synthesis of soluble donor-acceptor double-cable polymers based on polythiophene and tetracyanoanthraquinodimethane (TCAQ) [J].
Giacalone, F ;
Segura, JL ;
Martín, N ;
Catellani, M ;
Luzzati, S ;
Lupsac, N .
ORGANIC LETTERS, 2003, 5 (10) :1669-1672
[14]   EFFICIENT PHOTODIODES FROM INTERPENETRATING POLYMER NETWORKS [J].
HALLS, JJM ;
WALSH, CA ;
GREENHAM, NC ;
MARSEGLIA, EA ;
FRIEND, RH ;
MORATTI, SC ;
HOLMES, AB .
NATURE, 1995, 376 (6540) :498-500
[15]   INFRARED STUDY OF ANTHRAQUINONE-ANION-RADICAL AND ITS O-18 LABELED ISOMER [J].
JUCHNOVSKI, IN ;
KOLEV, TM .
SPECTROSCOPY LETTERS, 1986, 19 (10) :1183-1193
[16]   ULTRAFAST PHOTOINDUCED ELECTRON-TRANSFER IN CONDUCTING POLYMER BUCKMINSTERFULLERENE COMPOSITES [J].
KRAABEL, B ;
LEE, CH ;
MCBRANCH, D ;
MOSES, D ;
SARICIFTCI, NS ;
HEEGER, AJ .
CHEMICAL PHYSICS LETTERS, 1993, 213 (3-4) :389-394
[17]   Studies of charged excitations in pi-conjugated oligomers and polymers by optical modulation [J].
Lane, PA ;
Wei, X ;
Vardeny, ZV .
PHYSICAL REVIEW LETTERS, 1996, 77 (08) :1544-1547
[18]   Tuning of the photoinduced charge transfer process in donor-acceptor double-cable copolymers [J].
Luzzati, S ;
Scharber, M ;
Catellani, M ;
Lupsac, NO ;
Giacalone, F ;
Segura, JL ;
Martin, N ;
Neugebauer, H ;
Sariciftci, NS .
SYNTHETIC METALS, 2003, 139 (03) :731-733
[19]   New polythiophenes bearing electron-acceptor phthalocyanine chromophores [J].
Martínez-Díaz, MV ;
Esperanza, S ;
De la Escosura, A ;
Catellani, M ;
Yunus, S ;
Luzzati, S ;
Torres, T .
TETRAHEDRON LETTERS, 2003, 44 (46) :8475-8478
[20]   DOPING EFFECT OF BUCKMINSTERFULLERENE IN CONDUCTING POLYMER - CHANGE OF ABSORPTION-SPECTRUM AND QUENCHING OF LUMINESCENCE [J].
MORITA, S ;
ZAKHIDOV, AA ;
YOSHINO, K .
SOLID STATE COMMUNICATIONS, 1992, 82 (04) :249-252