Chemical Vapor Deposition Growth of Few-Layer MoTe2 in the 2H, 1T′, and 1T Phases: Tunable Properties of MoTe2 Films
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- 作者：Thomas A. EmpanteYao Zhou ; Velveth Klee ; Ariana E. Nguyen ; I-Hsi Lu ; Michael D. Valentin ; Sepedeh A. Naghibi Alvillar ; Edwin Preciado ; Adam J. Berges ; Cindy S. Merida ; Michael Gomez ; Sarah Bobek ; Miguel Isarraraz ; Evan J. Reed ; Ludwig Bartels
- 刊名：ACS Nano
- 出版年：2017
- 出版时间：January 24, 2017
- 年：2017
- 卷：11
- 期：1
- 页码：900-905
- 全文大小：390K
- ISSN：1936-086X
文摘
Chemical vapor deposition allows the preparation of few-layer films of MoTe2 in three distinct structural phases depending on the growth quench temperature: 2H, 1T′, and 1T. We present experimental and computed Raman spectra for each of the phases and utilize transport measurements to explore the properties of the 1T MoTe2 phase. Density functional theory modeling predicts a (semi-)metallic character. Our experimental 1T films affirm the former, show facile μA-scale source-drain currents, and increase in conductivity with temperature, different from the 1T′ phase. Variation of the growth method allows the formation of hybrid films of mixed phases that exhibit susceptibility to gating and significantly increased conductivity.