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
[1]  
Brabec CJ, 2001, ADV FUNCT MATER, V11, P15, DOI 10.1002/1616-3028(200102)11:1<15::AID-ADFM15>3.0.CO
[2]  
2-A
[3]   Tracing photoinduced electron transfer process in conjugated polymer/fullerene bulk heterojunctions in real time [J].
Brabec, CJ ;
Zerza, G ;
Cerullo, G ;
De Silvestri, S ;
Luzzati, S ;
Hummelen, JC ;
Sariciftci, S .
CHEMICAL PHYSICS LETTERS, 2001, 340 (3-4) :232-236
[4]   Heterocyclic quinones as core units for redox switches:: UV-vis/NIR, FTIR spectroelectrochemistry and DFT calculations on the vibrational and electronic structure of the radical anions [J].
Büschel, M ;
Stadler, C ;
Lambert, C ;
Beck, M ;
Daub, J .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2000, 484 (01) :24-32
[5]  
Cao LM, 2001, ADV MATER, V13, P1701, DOI 10.1002/1521-4095(200111)13:22<1701::AID-ADMA1701>3.0.CO
[6]  
2-Q
[7]   Donor-acceptor polythiophene copolymers with tunable acceptor content for photoelectric conversion devices [J].
Catellani, M ;
Luzzati, S ;
Lupsac, NO ;
Mendichi, R ;
Consonni, R ;
Famulari, A ;
Meille, SV ;
Giacalone, F ;
Segura, JL ;
Martín, N .
JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (01) :67-74
[8]   Electrochemical and photophysical properties of a novel polythiophene with pendant fulleropyrrolidine moieties: Toward "double cable" polymers for optoelectronic devices [J].
Cravino, A ;
Zerza, G ;
Neugebauer, H ;
Maggini, M ;
Bucella, S ;
Menna, E ;
Svensson, M ;
Andersson, MR ;
Brabec, CJ ;
Sariciftci, NS .
JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (01) :70-76
[9]   Double-cable polymers for fullerene based organic optoelectronic applications [J].
Cravino, A ;
Sariciftci, NS .
JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (07) :1931-1943
[10]   Photoinduced charge carriers in conjugated polymer-fullerene composites studied with light-induced electron-spin resonance [J].
Dyakonov, V ;
Zoriniants, G ;
Scharber, M ;
Brabec, CJ ;
Janssen, RAJ ;
Hummelen, JC ;
Sariciftci, NS .
PHYSICAL REVIEW B, 1999, 59 (12) :8019-8025