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-Expanded) identifier identifier

  • Yayın Türü: Makale / Kısa Makale
  • Cilt numarası: 112 Sayı: 29
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1021/jp802700y
  • Dergi Adı: JOURNAL OF PHYSICAL CHEMISTRY C
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.10587-10590
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

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.