arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.07860cond-mat.mtrl-scicond-mat.mes-hall
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$\mathrm{MoTe}_{2}$的laser诱导金属相及其接触性能的扫描栅显微镜研究

Investigation of laser-induced-metal phase of $\mathrm{MoTe}_{2}$ and its contact property via scanning gate microscopy

Kohei Sakanashi, Hidemitsu Ouchi, Kota Kamiya, Peter Krüger, Katsuhiko Miyamoto, Takashige Omatsu, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Jonathan P. Bird, Nobuyuki Aoki

摘要:

虽然MoTe $_{2}$在大于0.3 MW/cm $^{2}$的高密度激光辐照下发生了半导体-金属相变,但我们发现激光诱导金属(LIM)相不是由多晶型结构相变产生的1 T '结构,而是由MoTe $_{2}$的光热分解诱导的半金属Te组成。该技术被用于制作具有非对称金属接触的Pd/2 H-MoTe $_{2}$ /LIM结构的场效应晶体管,并通过扫描栅显微镜研究其接触特性。我们确认,肖特基势垒(扩散电位)总是形成在Pd/2 H-MoTe $_{2}$边界和障碍的载流子输运,而欧姆接触实现在2 H-MoTe $_{2}$ /LIM相结的n-和p-型载流子。

英文摘要:

Although semiconductor to metal phase transformation of MoTe$_{2}$ by high-density laser irradiation of more than 0.3 MW/cm$^{2}$ has been reported, we reveal that the laser-induced-metal (LIM) phase is not the 1T' structure derived by a polymorphic-structural phase transition but consists instead of semi-metallic Te induced by photo-thermal decomposition of MoTe$_{2}$. The technique is used to fabricate a field effect transistor with a Pd/2H-MoTe$_{2}$/LIM structure having an asymmetric metallic contact, and its contact properties are studied via scanning gate microscopy. We confirm that a Schottky barrier (a diffusion potential) is always formed at the Pd/2H-MoTe$_{2}$ boundary and obstacles a carrier transport while an Ohmic contact is realized at the 2H-MoTe$_{2}$/LIM phase junction for both n- and p-type carriers.

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