Studies of polycrystalline pentacene thin-film transistors at the microscopic level

Horng Long Cheng, Wei Yang Chou, Chia Wei Kuo, Yu Shen Mai, Fu Ching Tang, Szu Hao Lai

研究成果: Conference contribution

3 引文 斯高帕斯(Scopus)

摘要

The electronic transport properties of polycrystalline pentacene-based thin film transistors (TFTs) were investigated at the microscopic level using microRaman spectroscopy. All the pentacene film, which were thermally evaporated as a layer with thickness of 70 nm, featured polycrystalline structure with only "thin film" phase polymorph and grain morphology as verified by x-ray diffraction (XRD) measurements. We have investigated the molecular vibrational modes of pentacene in the active channel during operations the organic TFT devices using in-situ Raman spectroscopy. Extra vibrational modes resulting from vibrational coupling effect in pentacene film were studied. The interlayer and intralayer intermolecular vibrational coupling energy was calculated from the Davydov splitting using a simple coupled-oscillator model. The results suggest that the C-H in-plane bending vibrational coupling energy of pentacene molecules in solid film is affected by operating device. Additionally, the aromatic C-C stretching vibrational modes also were investigated. However, it is rather difficult to obtain the variations of lattice parameters of pentacene film in a very small active channel by using electron diffraction and XRD. At the same time, MicroRaman technique provides the capability to explore the intermolecular coupling and molecular structure modifications.

原文English
主出版物標題Organic Field-Effect Transistors V
DOIs
出版狀態Published - 2006
事件Organic Field-Effect Transistors V - San Diego, CA, United States
持續時間: 2006 8月 132006 8月 15

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
6336
ISSN(列印)0277-786X

Other

OtherOrganic Field-Effect Transistors V
國家/地區United States
城市San Diego, CA
期間06-08-1306-08-15

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程

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