Luminescence of defects in the structural transformation of layered tin dichalcogenides

Layered tin sulfide semiconductors are both of fundamental interest and attractive for energy conversion applications. Sn sulfides crystallize in several stable bulk phases with different Sn:S ratios (SnS2, Sn2S3, and SnS), which can transform into phases with a lower sulfur concentration by introdu...

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Veröffentlicht in:Applied physics letters 2017-12, Vol.111 (26)
Hauptverfasser: Sutter, P., Komsa, H.-P., Krasheninnikov, A. V., Huang, Y., Sutter, E.
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container_issue 26
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container_title Applied physics letters
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creator Sutter, P.
Komsa, H.-P.
Krasheninnikov, A. V.
Huang, Y.
Sutter, E.
description Layered tin sulfide semiconductors are both of fundamental interest and attractive for energy conversion applications. Sn sulfides crystallize in several stable bulk phases with different Sn:S ratios (SnS2, Sn2S3, and SnS), which can transform into phases with a lower sulfur concentration by introduction of sulfur vacancies (VS). How this complex behavior affects the optoelectronic properties remains largely unknown but is of key importance for understanding light-matter interactions in this family of layered materials. Here, we use the capability to induce VS and drive a transformation between few-layer SnS2 and SnS by electron beam irradiation, combined with in-situ cathodoluminescence spectroscopy and ab-initio calculations to probe the role of defects in the luminescence of these materials. In addition to the characteristic band-edge emission of the endpoint structures, our results show emerging luminescence features accompanying the SnS2 to SnS transformation. Comparison with calculations indicates that the most prominent emission in SnS2 with sulfur vacancies is not due to luminescence from a defect level but involves recombination of excitons bound to neutral VS in SnS2. These findings provide insight into the intrinsic and defect-related optoelectronic properties of Sn chalcogenide semiconductors.
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source AIP Journals; Alma/SFX Local Collection
subjects Applied physics
Cathodoluminescence
Chalcogenides
Crystal defects
Electron beams
Electron irradiation
Energy conversion
Layered materials
Luminescence
Mathematical analysis
Optoelectronics
Semiconductors
Sulfur
Tin
Tin disulfide
Transformations
Vacancies
title Luminescence of defects in the structural transformation of layered tin dichalcogenides
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