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Pulsed Laser Assisted Polycrystalline Growth of Oxide Thin Films for Efficient Processing

Published online by Cambridge University Press:  18 May 2012

Tomohiko Nakajima,
Kentaro Shinoda and
Tetsuo Tsuchiya
Tomohiko Nakajima
Affiliation:
Flexible Chemical Coating Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
Kentaro Shinoda
Affiliation:
Flexible Chemical Coating Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
Tetsuo Tsuchiya
Affiliation:
Flexible Chemical Coating Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
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Abstract

We have investigated the polycrystalline growth by means of an excimer laser assisted metal organic deposition process and the strategy for the efficient growth. It was revealed that the pulsed photo thermal heating properties must be controlled by changing the laser fluence according to the substrate properties, such as thermal diffusivity. The threshold of the t eff value for initial crystal nucleation is approximately 70 ns for oxide thin films. For the fabrication of good quality films with high crystallinity and without a laser ablation of the film surface, it is necessary that the irradiated laser fluence is adjusted to the conditions of t eff (efficient annealing time) > 70 ns and T max (maximum temperature) < T m (melting point). Obtained oxide films by using the pulsed UV laser has large crystallite size, and it well functioned to enhance physical properties of films. For further efficient growth for polycrystalline growth of the oxide films, the starting solution containing nanoparticles is very useful: it is named as photo-reaction of nanoparticles process.

Keywords

coatingcrystal growththin film

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References

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