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Type: Artigo de periódico
Title: Short-pulse laser-induced crystallization of intrinsic and hydrogenated amorphous germanium thin films
Author: Mulato, M
Toet, D
Aichmayr, G
Santos, PV
Abstract: We report on the laser crystallization of intrinsic (a-Ge) and hydrogenated (a-Ge:H) amorphous germanium thin films using short, i.e., ns range, laser pulses. The influence of hydrogen on the phase transitions was investigated by monitoring the reflectance of the sample during laser irradiation. We determined the thresholds for melting (36 mJ/cm(2)) and for surface damage (66 mJ/cm(2)) of the a-Ge film. In a-Ge:H, hydrogen effuses on a short time scale (10 ns) upon laser irradiation. The effusion leads to the formation of a lifted-off (100 nm thick) crystalline Ge membrane, leaving behind a rough and incompletely crystallized surface. In a-Ge, on the other hand, no surface disruption is observed. The Raman spectra of hydrogenated samples are dominated by stress effects, while those corresponding to non-hydrogenated samples are dominated by crystallite size distribution effects. We also conclude that laser-induced annealing, carried out by applying several pulses with increasing intensity, can be used as a tool for the crystallization of a-Ge:H samples without hydrogen-induced surface damage. (C) 1997 American Institute of Physics.
Editor: Amer Inst Physics
Citation: Journal Of Applied Physics. Amer Inst Physics, v. 82, n. 10, n. 5159, n. 5166, 1997.
Rights: aberto
Identifier DOI: 10.1063/1.366320
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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