Ukrainian Journal of Physical Optics


2022, Volume 23, Issue 3


ISSN 1816-2002 (Online), ISSN 1609-1833 (Print)

Structural changes in As40S60-xSex thin films due to annealing and irradiation: Raman spectroscopy studies

1Voynarovych I., 2Hopko M., 2Edinak O., 1,2Gomonnai A. V.

1Institute of Electron Physics, Ukrainian National Academy of Sciences, 21 Universytetska Street, 88017 Uzhhorod, Ukraine; e-mail: voynar@ukr.net;
2Uzhhorod National University, 46 Pidhirna Street, 88000 Uzhhorod, Ukraine

ABSTRACT

We discuss evolution of Raman spectra for vitreous chalcogenide As40S60-xSex (x = 0, 20, 30, 40 and 60 at. %) layers, which occurs under thermal annealing and irradiation with the light of different wavelengths. It is demonstrated that composition dependences of the spectral Raman intensities are consistent with existence of ‘mixed’ As2S3-xSex pyramids. We reveal that the changes in the Raman spectra are associated with thermo- and photo-induced polymerization of the molecular fragments of mixed As4S(Se)4-type cages and S(Se) rings or chains.


Keywords: ternary chalcogenide As–S–Se glasses, thin films, photo-induced changes, Raman spectra

UDC: 535.4

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    Обговорено еволюцію спектрів комбінаційного розсіяння для склоподібних шарів халькогенідів As40S60-xSex (x = 0, 20, 30, 40 і 60 ат. %), яка відбувається при термічному відпалі та опроміненні світлом різних довжин хвиль. Показано, що композиційні залежності спектральних інтенсивностей комбінаційного розсіяння узгоджуються з існуванням «змішаних» пірамід As2S3-xSex. Виявлено, що зміни в спектрах комбінаційного розсіяння пов'язані з термо- та фотоіндукованою полімеризацією молекулярних фрагментів змішаних структурних клітинок типу As4S(Se)4 і кілець або ланцюгів S(Se).

    Ключові слова: потрійні халькогенідні As–S–Se скла, тонкі плівки, фотоіндуковані зміни, Раманівські спектри.
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