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논문 기본 정보

자료유형
학술저널
저자정보
Chae Yoon Im (Korea University of Technology and Education) Jong Gyeom Kim (Korea University of Technology and Education) Min Young Kwon (Korea University of Technology and Education) Suk Jun Kim (Korea University of Technology and Education)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.18 No.4
발행연도
2022.7
수록면
361 - 369 (9page)
DOI
https://doi.org/10.1007/s13391-022-00350-y

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초록· 키워드

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NiTe2 thin films have been considered promising candidates for transparent electrodes due to their high electrical conductivityand 2-dimensional (2D) layered structure. The transparency of 2D thin films with layered structure can be further improvedby the exfoliation process. In the process, the increase in electrical resistance should be minimized by maintaining electricalcontinuity in the thin film. In this study, the mixing ratio of ethanol, acetone, and DI water in the solvent for the liquidphaseexfoliation (LPE) process was optimized to achieve high transmittance while suppressing the increase in electricalresistance. We prepared three solvents by varying the mixing ratio (ethanol:acetone:DI water = 2:4:4, 3:3:4, and 4:2:4). Inthe three mixed solvents, NiTe2thin films were removed by two mechanisms: separation from the substrate and layer-bylayerexfoliation. Some of the NiTe2grains were separated from the glass substrate in the early stage of the LPE process,and layer-by-layer exfoliation became the major mechanism when LPE proceeded longer than 6 h in the three solvents. Among the three solvents, the one with a 3:3:4 ratio more effectively suppressed the increase in electrical resistance duringthe separation of the NiTe2thin film. The separation of NiTe2grains provided an advantageous condition for layer-by-layerexfoliation. Additionally, the similarity of the polarization and dispersion ratio of 3-3-4 with the one of NiTe2acceleratedlayer-by-layer exfoliation. The optimized solvent of 3-3-4 improved the transmittance of the NiTe2thin film from 59.6% to68.4% after the 8-h LPE process.

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