Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.7: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
Structure optimization of pentacene thin film transistors controlled by substrate temperature and annealing — •Tossapol Tippo1, Chanchana Thanachayanont2, Steffen Schulze3, Michael Hietschold3, and Apinunt Thanachayanont1 — 1Faculty of Engineering and College of Data Storage Technology and Applications, King Mongkut's Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang Bangkok 10520, Thailand — 2National Metal and Materials Technology Center, Thailand Science Park, Klong 1, Klong Luang, Pathumthani 12120, Thailand — 3Chemnitz University of Technology, Solid Surface Analysis Group, D-09107 Chemnitz, Germany
Pentacene thin film transistors (TFTs) were fabricated by thermal evaporation of the organic molecules. The structure of the vacuum deposited pentacene thin films is very sensitive to numerous deposition parameters. The pentacene thin films were characterized to study the effect of substrate temperature during the deposition in order to maximize grain sizes and the effect of annealing to improve the current paths through the grains of pentacene thin films. Scanning electron microscopy indicated that the higher substrate temperature resulted in the larger grain size. Subsequent annealing enhances dense packing of grains by reducing the space between them. The results also suggested that the evolution of the film growth is very sensitive to the crystal quality of the initial state of growth close to the substrate film interface.