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Formation of Submicron Single Crystal Particles and Dots by Laser Ablation

Published online by Cambridge University Press:  28 February 2011

Hong Wu ,
R. D. Vispute  and
J. Narayan
Hong Wu
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
R. D. Vispute
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
J. Narayan
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
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Abstract

We have investigated the formation of micron-sized single crystal dots of germanium by pulsed laser ablation. The laser ablation of a Ge target (KrF excimer laser λ=248 nm, pulse rate 10Hz, pulse duration 25x10−9 seconds, and energy 10J /cm2) results in the formation of micron and submicron liquid droplets which are ejected from the target. These droplets can be crystallized into single crystal dots on lattice-matched substrates by rapid liquid-phase recrystallization. We report the details of microstructure as a function of dot size. It is found that under these conditions, below a critical size (about 2μm), the dots are crystalline;above which dots become polycrystalline. We discuss the implications of the results in producing doped and undoped single-crystal quantum dots for device applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 145
Copyright
Copyright © Materials Research Society 1995

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References

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