標題: Ultrafast relaxation dynamics of photoexcitations in poly(3-hexylthiophene) for the determination of the defect concentration
作者: Lee, Yu Hsien
Yabushita, Atsushi
Hsu, Chain Shu
Yang, Sheng Hsiung
Iwakura, Izumi
Luo, Chih Wei
Wu, Kaung Hsiung
Kobayashi, Takayoshi
照明與能源光電研究所
電子物理學系
應用化學系
Institute of Lighting and Energy Photonics
Department of Electrophysics
Department of Applied Chemistry
公開日期: 30-Sep-2010
摘要: Ultrafast pump-probe spectroscopy of poly(3-hexylthiophene) (P3HT) films was performed using a 9-fs laser and a broadband lock-in detection system. The fast geometrical relaxation (GR) time was attributed to the transition from a free exciton (FE) to form a bound polaron pair (BPP), and the time constant was estimated to be tau(GR) = 90 +/- 2 fs. The relaxation time constant of BPP was determined as tau(BPP) = 710 +/- 40 fs. The measurement of pump-power dependence enabled us to distinguish the defect trapping process of BPPs from other parallel decay processes and to determine the defect concentration of a P3HT thin film. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.cplett.2010.08.036
http://hdl.handle.net/11536/32168
ISSN: 0009-2614
DOI: 10.1016/j.cplett.2010.08.036
期刊: CHEMICAL PHYSICS LETTERS
Volume: 498
Issue: 1-3
起始頁: 71
結束頁: 76
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