Conjugation effects on carrier mobilities of polythiophenes probed by time-resolved terahertz spectroscopy


Esenturk O. , Kline R. J. , Deongchamp D. M. , Heilweil E. J.

JOURNAL OF PHYSICAL CHEMISTRY C, cilt.112, sa.29, ss.10587-10590, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Kısa Makale
  • Cilt numarası: 112 Konu: 29
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1021/jp802700y
  • Dergi Adı: JOURNAL OF PHYSICAL CHEMISTRY C
  • Sayfa Sayıları: ss.10587-10590

Özet

Optically generated carrier conductivity of thiophene-based spin-cast polymer films, as cast poly(3-hexylthiophene) (P3HT) and both as cast and above liquid crystalline temperature annealed poly(2,5-bis(3tetradecylthiophen-2yl)thieno[3,2-b]thiophene) (PBTTT), were measured by time-resolved THz spectroscopy (TRTS) and compared to reported thin-film transistor (TFT) device measurements. The relative mobilities of the samples measured by TRTS agree well with reported TFl` mobilities. Since TRTS is sensitive to shortrange carrier mobility, this study suggests that increased mobility of PBTTT relative to P3HT films arises from improved ordering of the local structure, increased effective conjugation length, and planarity of PBTTT molecules in the solid state.