1-Available online at www.sciencedirect.com
SCII!N CI! @OIRI!CT'
Applied Surface Science 252 (200fi) 48R6---4R96
2- applied
surface science
www.elsevicr.corn/locate/apsusc
3- New PLAD apparatus and fabrication of epitaxial films
and junctions of functional materials: SiC, GaN,
ZnO, diamond and GMR layers
4- Hachizo Muto *, Takeshi Kusumori, Toshiyuki Nakamura,
Takashi Asano, Takahiro Hori
5 - Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology (AIST) ChI/1m,
2266-98 Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan
Received 3 May 2005; accepted IS July 2005
Available online 24 October 2005
6 - Abstract
7 -We have developed a new pulsed laser ablation-cleposition (PLAD) apparatus and techniques for fabricating films of high-temperature or functional materials
8- including two short-wavelength lasers: (a) a YAG 5th harmonic (213 nm) and (b) Raman-shifted lasers containing vacuum ultraviolet light
9- also involved are (c) a high-temperature heater with a maximum temperature of 1350 "C, (d) dual-target simultaneous ablation mechanics, and (e) hybrid PLAD using a pi co-second YAG laser combined with (c) and/or (e1).
10- Using the high-Theater, hetero-epitaxial films of 3C-, 2H- and 4H-SiC have been prepared on sapphire-c. In situ p-doping for GaN epitaxial films is achieved by simultaneous ablation of GaN and
Mg targets by (d) during film growth
11- Junctions such as pGaN (Mg-dopedj-filrn/n-Si'Clf 0 01) substrate and pGaN/n-Si(l 1 I) show good diode characteristics.
12- Epitaxial films with a diamond lattice can be grown on the sapphire-c plane by hybrid PLAD (e) with a high-Theater using a 6H- SiC target.
13- High quality epitaxial films of ZnO are grown by PLAD by introducing a low-temperature self-buffer layer: magnetization of ferromagnetic materials is enforced by overlaying on a ferromagnetic lattice plane of an anti-ferromagnetic material
14- showing the value of the layer-overlaying method in improving quality. The short-wavelength lasers are useful in reducing surface particles on functional films, including
superconductors.
15- © 2005 Elsevier B.Y. Al1 rights reserved.
Keywords: PLAD apparatus; Epitaxial film;
Functional material
16- 1. Introduction
17- Pulsed laser ablation (PLA) is in practical use in industrial
and medical fields concerned with cutting and processing
techniques [1,2], and evaporation methods for chemical
analyses [3].
18- Phase conversion from amorphous Si to
polycrystals is studied by a laser annealing technique at
intermediate laser energy densities suitable for preparing
electro-optical devices [4].
19- PLAD has many advantages
including high quality film preparation and wide applicability
to almost any material.
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