Luminescence of defects in the structural transformation of layered tin dichalcogenides
- Univ. of Nebraska, Lincoln, NE (United States)
- Aalto Univ., Otaniemi (Finland)
- Aalto Univ., Otaniemi (Finland); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); National Univ. of Science and Technology MISiS, Moscow (Russia)
- Chinese Academy of Sciences (CAS), Beijing (China)
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. In this work, 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 results provide insight into the intrinsic and defect-related optoelectronic properties of Sn chalcogenide semiconductors.
- Research Organization:
- Univ. of Nebraska, Lincoln, NE (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0016343
- OSTI ID:
- 1527164
- Alternate ID(s):
- OSTI ID: 1414972
- Journal Information:
- Applied Physics Letters, Vol. 111, Issue 26; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | December 2019 |
Wrap‐Around Core–Shell Heterostructures of Layered Crystals
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journal | May 2019 |
Direct optical-structure correlation in atomically thin dichalcogenides and heterostructures
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journal | January 2020 |
Exploring single-layered SnSe honeycomb polymorphs for optoelectronic and photovoltaic applications
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journal | February 2018 |
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