Raman evidence for the oxidation of amorphous As2(SexS1–x)3 film surfaces under visible light

Raman spectra of thermally evaporated As2Se3 and Se-rich (above 50 at. %) ternary As–Se–S films measured at high (above 1 MW cm−2) excitation power density reveal new narrow peaks emerging during the measurements which are attributed to crystalline arsenolite As2O3. The latter is formed on the As–Se...

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Published in:Materials research express 2024-04, Vol.11 (4), p.046405
Main Authors: Azhniuk, Yuriy, Lopushansky, Vasyl, Loya, Vasyl, Solonenko, Dmytro, Kryshenik, Volodymyr, Voynarovych, Ivan, Gomonnai, Alexander V, Zahn, Dietrich R T
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Language:English
Subjects:
amorphous semiconductors
Arsenic
Arsenic triselenide
Arsenic trisulfide
atomic force microscopy
Light
Oxidation
photochemical reactions
Raman spectra
Raman spectroscopy
Selenium
Thermal decomposition
Ultraviolet radiation
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container_title Materials research express
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creator Azhniuk, Yuriy
Lopushansky, Vasyl
Loya, Vasyl
Solonenko, Dmytro
Kryshenik, Volodymyr
Voynarovych, Ivan
Gomonnai, Alexander V
Zahn, Dietrich R T
description Raman spectra of thermally evaporated As2Se3 and Se-rich (above 50 at. %) ternary As–Se–S films measured at high (above 1 MW cm−2) excitation power density reveal new narrow peaks emerging during the measurements which are attributed to crystalline arsenolite As2O3. The latter is formed on the As–Se–S film surface due to thermal decomposition of the film and oxidation of arsenic in ambient air. Contrary to As2S3, for which the photoassisted oxidation of the film surface requires UV light, for narrower-gap As–Se–S films this effect occurs under illumination by visible light.
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subjects amorphous semiconductors
Arsenic
Arsenic triselenide
Arsenic trisulfide
atomic force microscopy
Light
Oxidation
photochemical reactions
Raman spectra
Raman spectroscopy
Selenium
Thermal decomposition
Ultraviolet radiation
title Raman evidence for the oxidation of amorphous As2(SexS1–x)3 film surfaces under visible light
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