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Improved electrical properties of atomic layer deposited tin disulfide at low temperatures using ZrO2 layer

Title
Improved electrical properties of atomic layer deposited tin disulfide at low temperatures using ZrO2 layer
Author
전형탁
Keywords
TRANSITION-METAL DICHALCOGENIDES; FIELD-EFFECT TRANSISTORS; MOS2 TRANSISTORS; MONOLAYER; GRAPHENE; SNS2
Issue Date
2017-02
Publisher
AMER INST PHYSICS
Citation
AIP ADVANCES, v. 7, no. 2, Article no. 025311
Abstract
We report the effect of zirconium oxide (ZrO2) layers on the electrical characteristics of multilayered tin disulfide (SnS2) formed by atomic layer deposition (ALD) at low temperatures. SnS2 is a two-dimensional (2D) layered material which exhibits a promising electrical characteristics as a channel material for field-effect transistors (FETs) because of its high mobility, good on/off ratio and low temperature processability. In order to apply these 2D materials to large-scale and flexible electronics, it is essential to develop processes that are compatible with current electronic device manufacturing technology which should be conducted at low temperatures. Here, we deposited a crystalline SnS2 at 150 degrees C using ALD, and we then annealed at 300 degrees C. X-ray diffraction (XRD) and Raman spectroscopy measurements before and after the annealing showed that SnS2 had a hexagonal (001) peak at 14.9 degrees and A(1g) mode at 313 cm(-1). The annealed SnS2 exhibited clearly a layered structure confirmed by the high resolution transmission electron microscope (HRTEM) images. Back-gate FETs with SnS2 channel sandwiched by top and bottom ZrO2 on p(++) Si/SiO2 substrate were suggested to improve electrical characteristics. We used a bottom ZrO2 layer to increase adhesion between the channel and the substrate and a top ZrO2 layer to improve contact property, passivate surface, and protect from process-induced damages to the channel. ZTZ (ZrO2/SnS2/ZrO2) FETs showed improved electrical characteristics with an on/off ratio of from 0.39 x10(3) to 6.39 x10(3) and a mobility of from 0.0076 cm(2)/ Vs to 0.06 cm(2)/Vs. (c) 2017 Author(s).
URI
https://aip.scitation.org/doi/10.1063/1.4977887http://repository.hanyang.ac.kr/handle/20.500.11754/112648
ISSN
2158-3226
DOI
10.1063/1.4977887
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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