Features of photoacoustic transformation in microporous nanocrystalline silicon

Autor:	I.V. Gavrilchenko, Mykola Isaiev, D. Andrusenko, R. M. Burbelo, Alona Tytarenko, A. G. Kuzmich, V. A. Skryshevskii
Rok vydání:	2014
Předmět:	Photoacoustic effect Materials science Physics and Astronomy (miscellaneous) Silicon business.industry Nanocrystalline silicon chemistry.chemical_element Microporous material Substrate (electronics) Piezoelectricity Monocrystalline silicon chemistry Absorption edge Optoelectronics business
Zdroj:	Technical Physics Letters. 40:188-191
ISSN:	1090-6533 1063-7850
DOI:	10.1134/s1063785014030146
Popis:	Results of a study of the photoacoustic transformation in microporous nanocrystalline silicon are described. The amplitude-frequency and phase-frequency characteristics of the photoacoustic signal from microporous silicon samples on a monocrystalline substrate exposed to illumination at various wavelengths are experimentally determined. Informative response was measured by the gas-microphone and piezoelectric detection methods. In terms of the proposed mathematical model, it is shown that the difference in the parameters of the photoacoustic signal for different wavelengths of exciting radiation is attributed to a shift of the fundamental absorption edge in nanocrystalline silicon. It is pointed out that the piezoelectric detection method is more sensitive to changes in the thermophysical and optical parameters of the porous layer.
Databáze:	OpenAIRE
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