Ultrafast relaxation dynamics of photoexcitations in poly(3-hexylthiophene) for the determination of the defect concentration

Yu Hsien Lee, Atsushi Yabushita, Chain-Shu Hsu, Sheng-Hsiung Yang, Izumi Iwakura, Chih-Wei Luo, Kaung-Hsiung Wu, Takayoshi Kobayashi

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Abstract

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 τGR = 90 ± 2 fs. The relaxation time constant of BPP was determined as τBPP = 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.

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalChemical Physics Letters
Volume498
Issue number1-3
DOIs
StatePublished - 30 Sep 2010

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