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

doi:10.1117/12.678724

25 August 2006 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

Proceedings Volume 6336, Organic Field-Effect Transistors V; 63361B (2006) https://doi.org/10.1117/12.678724
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

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.

Citation Download Citation

Horng-Long Cheng, Wei-Yang Chou, Chia-Wei Kuo, Yu-Shen Mai, Fu-Ching Tang, and Szu-Hao Lai "Studies of polycrystalline pentacene thin-film transistors at the microscopic level", Proc. SPIE 6336, Organic Field-Effect Transistors V, 63361B (25 August 2006); https://doi.org/10.1117/12.678724

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