Enhancing the performance of organic thin-film transistors using a novel photoalignment method

Wei Yang Chou, Chia Wei Kuo, Yu Shen Mai, Shih Ting Lin, Horng Long Cheng, Chi Chang Liao, Dun Ying Shu

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


This study first demonstrated the feasibility of using the photoalignment method to adequately control the structural anisotropy of pentacene films, which are active semiconducting layers, in thin-film transistors (TFTs) with conspicuous anisotropic electrical characteristics. The photoaligned pentacene films were characterized with respect to structure and morphology using x-ray diffraction, atomic force microscopy and Raman scattering. Compared to the uncontrolled pentacene films, a maximum 25-times increase in field-effect mobility (up to 0.82 cm2/Vs) is achieved in the photoaligned pentacene-based TFTs by aligning pentacene orientation parallel to the current flow direction using a photoaligned polyimide layer. Mobility anisotropic ratios ranging between 2.7 -8.3 for the current flow parallel and perpendicular to the alignment of the photoaligned pentacene films have been observed for photoaligned pentacene-based TFTs.

Original languageEnglish
Article number27
Pages (from-to)97-108
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2004
EventOrganic Field-Effect Transistors III - Denver, CO, United States
Duration: 2004 Aug 32004 Aug 5

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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