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Proceedings Paper

Investigation of the dynamics of phase transitions on silicon surface at light pulse heating
Author(s): Yakh'ya V. Fattakhov; Mansur F. Galyautdinov; Tat'yana N. L'vova; M. V. Zakharov; Il'dus B. Khaibullin
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Paper Abstract

The nucleation and growth of local molten regions (LMRs) during the light irradiation was detected using high-speed camera and long-focus microscope. In situ dependences of sizes and density (quantity per cm-2) of LMRs are interpreted in the frame of the following model. A great amount of heat is transferred to the semiconductor surface during light pulse irradiation. This proces is nonstationary and the heat is not distributed homogeneously over the thickness of the sample. As a result, a specific short-lived state is formed, in which the semiconductor surface is superheated in the solid-state phase with respect to the equilibrium melting temperature. Some surface areas, which contain the defects, begin to melt. Temperature of these local molten regions immediately decreases down to the equilibrium melting temperature. The created LMRs begin to absorb the heat from neighboring superheated solid regions. As a result, the temperature of superheated regions decreases down to the equilibrium melting point. No new local molten regions are formed and the sizes of existing local molten regions increase due to absorption of the energy of light pulse. To study the main features of local melting more detail in-situ investigations of mechanism of this effect were carried out at incoherent light irradiation with different pulse durations and irradiation power densities. The last our results agree with the superheating model. Also the dynamics of phase transitions on the surface of implanted silicon at different regimes of light pulses is investigated using high-speed camera and special diffraction gratings. The diffraction gratings were formed using ion implantation and the effect of local melting. The dynamics of diffraction during and after the light pulse irradiation was studied.

Paper Details

Date Published: 15 November 2001
PDF: 10 pages
Proc. SPIE 4605, PECS 2001: Photon Echo and Coherent Spectroscopy, (15 November 2001); doi: 10.1117/12.447992
Show Author Affiliations
Yakh'ya V. Fattakhov, Kazan Physical-Technical Institute (Russia)
Mansur F. Galyautdinov, Kazan Physical-Technical Institute (Russia)
Tat'yana N. L'vova, Kazan Physical-Technical Institute (Russia)
M. V. Zakharov, Kazan Physical-Technical Institute (Russia)
Il'dus B. Khaibullin, Kazan Physical-Technical Institute (Russia)

Published in SPIE Proceedings Vol. 4605:
PECS 2001: Photon Echo and Coherent Spectroscopy
Vitaly V. Samartsev, Editor(s)

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