Ultrafast photogeneration of inter-chain charge pairs in polythiophene films

被引：84

作者：

Ruseckas, A

Theander, M

Andersson, MR

Svensson, M

Prato, M

Inganäs, O

Sundström, V

机构：

[1] Univ Lund, Dept Phys Chem, S-22100 Lund, Sweden

[2] Inst Phys, LT-2600 Vilnius, Lithuania

[3] Linkoping Univ, IFM, Dept Phys, S-58183 Linkoping, Sweden

[4] Chalmers Univ Technol, Dept Polymer Technol, S-41296 Gothenburg, Sweden

[5] Univ Trieste, Dipartimento Sci Farmaceut, I-34127 Trieste, Italy

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 322卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(00)00397-3

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：

Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with similar to 20% efficiency in a polymer with short inter-chain distance (similar to 4 Angstrom) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton-charge transfer states, which quickly evolve to inter-chain CPs. (C) 2000 Elsevier Science B.V, All rights reserved.

引用

页码：136 / 142

页数：7

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