Characterization of oxide nanocomposites formed at annealed TiN/SnS2 heterostructure thin film
- Title
- Characterization of oxide nanocomposites formed at annealed TiN/SnS2 heterostructure thin film
- Author
- 박태주
- Keywords
- Nanocomposites; Oxidation; SnS2; TiN; SnO2-TiO2; X-ray absorption spectrosco
- Issue Date
- 2020-01
- Publisher
- Elsevier B.V.
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v. 814, Article no. 152286, 9pp
- Abstract
- The compositional evolution of TiN/SnS2 thin films exposed to post-deposition annealing (PDA) at various O-2 pressures (P(O-2) = 0, 0.1, 1, 2 and 5 Torr) was examined using X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy and transmission electron microscopy. All the results of the analyses showed that the PDA oxidized the hetero-structured films to form SnO2+TiO2 nanocomposites throughout the film, driving out sulfur ions. The chemical and microstructural evolution according to the oxidation was confirmed by TEM and the energy-dispersive spectroscopy analyses. The XAS analysis particularly showed that with increasing P(O-2), the composition of the nanocomposites changed and the microstructure of the titania in the nanocomposites evolved from an anatase to a rutile structure gradually. The conduction band structure also changed in accordance with this microstructural evolution. Electrical measurements on devices with the oxidized SnS2/TiN heterostructure and additional thick TiN metal electrode, further showed that the contact resistance decreased dramatically after the PDA. This implies that the formation of SnO2+TiO2 at the interface between semiconducting SnS2 and metallic TiN can be an effective way to improve the metal-semiconductor contacts. (C) 2019 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0925838819335327https://repository.hanyang.ac.kr/handle/20.500.11754/163244
- ISSN
- 0925-8388
- DOI
- 10.1016/j.jallcom.2019.152286
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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