Department of Materials Science and Engineering, Stanford University , Stanford, California 94304, United States.
ACS Nano. 2017 Jan 24;11(1):900-905. doi: 10.1021/acsnano.6b07499. Epub 2017 Jan 3.
Chemical vapor deposition allows the preparation of few-layer films of MoTe 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 MoTe 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.
化学气相沉积允许根据生长淬火温度制备具有三种不同结构相的 MoTe 少层薄膜:2H、1T' 和 1T。我们为每个相呈现了实验和计算的拉曼光谱,并利用输运测量来探索 1T MoTe 相的性质。密度泛函理论建模预测了一种(半)金属性质。我们的实验 1T 薄膜证实了这一点,表现出易于实现的 μA 级源漏电流,并且电导率随温度升高而增加,这与 1T' 相不同。生长方法的变化允许形成混合相的混合薄膜,这些薄膜表现出对门控的敏感性和显著增加的电导率。