KFU. Card publication. Optical and positron annihilation studies of structural defects in LiInSe2 single crystals

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FEDERAL UNIVERSITY

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OPTICAL AND POSITRON ANNIHILATION STUDIES OF STRUCTURAL DEFECTS IN LIINSE2 SINGLE CRYSTALS

Form of presentation

Articles in international journals and collections

Year of publication

2020

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Authors, employees of KFU

Belushkin Aleksandr Vladislavovich, author

Other authors

Goloshumova A.A. , author

Horodek P. , author

Isaenko L.I. , author

Lobanov S.I. , author

Siemek K. , author

Yelisseyev A.P. , author

Bibliographic description in the original language

Siemek K. Optical and positron annihilation studies of structural defects in LiInSe2 single crystals / K. Siemek, A.P. Yelisseyev, P. Horodek, S.I. Lobanov, A.A. Goloshumova, A.V. Belushkin, L.I. Isaenko // Optical Materials. - 2020. - v.109. - P. 110262-110269.

Annotation

Lithium-indium di-selenide (LiInSe2) is a semiconductor material, which has been shown promising for applications in nonlinear optics and neutron detection. LiInSe2 crystals of optical quality, of different (from greenish to red) color were grown. Analysis of the fundamental absorption edge shows allowed direct band-to-band transitions and reveals structural disorder leading to the blurring of the edges of valence and conduction bands. Photoluminescence (PL) intensity is low in LiInSe2 of stoichiometric composition and increases after sample annealing in Se vapors. A narrow line at 408 nm is associated with free excitons. Analysis of PL and PL excitation spectra allows one to associate broad emission bands with point defects as well as with self-trapped excitons. The mean positron lifetime increases after annealing in Se vapor as a result of changes of the dominating defect type. For red crystals only big voids with lifetime of about 1021 ps are observed. Both methods suggest that greenish and red coloring of LiInSe2 are due to Se vacancies and interstitial Se atoms, respectively.

Keywords

Lithium-indium di-selenide, Semiconductor, Point defects, Absorption,Photoluminescence, Positron annihilation

The name of the journal

Optical Materials

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=237217&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Belushkin Aleksandr Vladislavovich	ru_RU
dc.contributor.author	Goloshumova A.A.	ru_RU
dc.contributor.author	Horodek P.	ru_RU
dc.contributor.author	Isaenko L.I.	ru_RU
dc.contributor.author	Lobanov S.I.	ru_RU
dc.contributor.author	Siemek K.	ru_RU
dc.contributor.author	Yelisseyev A.P.	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Siemek K. Optical and positron annihilation studies of structural defects in LiInSe2 single crystals / K. Siemek, A.P. Yelisseyev, P. Horodek, S.I. Lobanov, A.A. Goloshumova, A.V. Belushkin, L.I. Isaenko // Optical Materials. - 2020. - v.109. - P. 110262-110269.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=237217&p_lang=2	ru_RU
dc.description.abstract	Optical Materials	ru_RU
dc.description.abstract	Lithium-indium di-selenide (LiInSe2) is a semiconductor material, which has been shown promising for applications in nonlinear optics and neutron detection. LiInSe2 crystals of optical quality, of different (from greenish to red) color were grown. Analysis of the fundamental absorption edge shows allowed direct band-to-band transitions and reveals structural disorder leading to the blurring of the edges of valence and conduction bands. Photoluminescence (PL) intensity is low in LiInSe2 of stoichiometric composition and increases after sample annealing in Se vapors. A narrow line at 408 nm is associated with free excitons. Analysis of PL and PL excitation spectra allows one to associate broad emission bands with point defects as well as with self-trapped excitons. The mean positron lifetime increases after annealing in Se vapor as a result of changes of the dominating defect type. For red crystals only big voids with lifetime of about 1021 ps are observed. Both methods suggest that greenish and red coloring of LiInSe2 are due to Se vacancies and interstitial Se atoms, respectively.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Lithium-indium di-selenide	ru_RU
dc.subject	Semiconductor	ru_RU
dc.subject	Point defects	ru_RU
dc.subject	Absorption	ru_RU
dc.subject	Photoluminescence	ru_RU
dc.subject	Positron annihilation	ru_RU
dc.title	Optical and positron annihilation studies of structural defects in LiInSe2 single crystals	ru_RU
dc.type	Articles in international journals and collections	ru_RU