Deposition of crystal polythiophene thin films by KrF excimer laser ablation
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Deposition of crystal polythiophene thin films by KrF excimer laser ablation Y.F. Lu,a) Z.M. Ren, Z.H. Mai, and T.C. Chong Laser Microprocessing Laboratory, Department of Electrical Engineering and Data Storage Institute, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
S.C. Ng and P. Miao Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
B.A. Cheong, S.K. Chow, and T.Y.F. Liew Data Storage Institute, 10 Kent Ridge Crescent, Singapore 119260 (Received 1 May 1999; accepted 25 October 1999)
Thin films of polythiophene, a kind of polyheterocyclic compound with hydrogen function groups, were deposited by KrF excimer laser ablation of a compressed solid target in a vacuum chamber. The laser pulse fluence was approximately selected at 2 J/cm2 with a pulse duration of 25 ns. The structural, topographic, and electronic properties of the deposited thin films were analyzed by atomic force microscope, x-ray diffraction, and Raman and infrared spectroscopy measurements. Deposited thin films were observed to have good crystal properties and to be composed of crystalline cubes with a uniform size of 0.1 m. The electronic structure of the deposited thin films should be different from the target materials, resulting from the laser irradiation effects. The influence of the deposition temperature on the structural and electronic properties of the deposited thin films was studied.
I. INTRODUCTION
Currently, there is an increasing interest in the industrial applications of conducting polymers and polymerbased optoelectronic materials due to their unique properties. The fabrication of polymer light-emitting device (PLED) is receiving tremendous attentions in recent years (Refs. 1–3 and references therein). Recently, the prototype PLED based on polyheterocyclic compound has been experimentally realized and some detailed studies have been carried out.2–4 The applications of polymers in light-emitting devices based on their electroluminescence natures are quite promising. The research results of PLED also suggest the possibility of applying polymer materials in the design and fabrication of new laser facilities in the near future. In many practical applications, polyheterocyclic compounds such as polyaniline and polythiophene were used as basic materials with different kinds of function group junctions. In industrial applications, polymers are normally in their bulk forms such as basic forms, alloys, and blends. Besides the bulk forms, the applications of polymers in thin-film forms are intensively needed in the miniaturization and integration technologies. Some fabrication a)
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J. Mater. Res., Vol. 15, No. 2, Feb 2000 Downloaded: 16 Mar 2015
methods of polymer thin films have been investigated such as vacuum evaporation,5–7 plasma polymerization,8,9 synchrotron radiation photodecomposition,10 spin coating,1–4,11 chemical vapor deposition,12 photodeco
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