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7 March 2008Effects of laser wavelength, fluence, and pulse duration on infrared pulsed laser deposition of a conducting polymer
Thin films of a conducting polymer have been grown by resonant infrared matrix-assisted pulsed-laser evaporation
(RIR-MAPLE). Properties of the thin films such as surface morphology and electrical conductivity have
been investigated as a function of laser wavelength, fluence, and pulse structure. Using a free-electron laser
whose wavelength is continuously tunable throughout the mid-infrared region (2-10 μm), we are able to deposit
polymer films from various liquid matrices by resonantly exciting selective vibrational modes of the solvent. An
Er:YAG laser operating at 2.94 μm is used to study the effects of different laser pulse durations. In the case of
poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), it is found that only specific excitation
wavelengths and pulse durations lead to the deposition of smooth and functional polymer films.
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S. L. Johnson, K. Appavoo, H. K. Park, R. F. Haglund Jr., "Effects of laser wavelength, fluence, and pulse duration on infrared pulsed laser deposition of a conducting polymer," Proc. SPIE 6879, Photon Processing in Microelectronics and Photonics VII, 68790Y (7 March 2008); https://doi.org/10.1117/12.764035