Monolayer PtSe2, a New Semiconducting Transition-Metal-Dichalcogenide, Epitaxially Grown by Direct Selenization of Pt

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• 作者：Yeliang Wang ; Linfei Li ; Wei Yao ; Shiru Song ; J. T. Sun ; Jinbo Pan ; Xiao Ren ; Chen Li ; Eiji Okunishi ; Yu-Qi Wang ; Eryin Wang ; Yan Shao ; Y. Y. Zhang ; Hai-tao Yang ; Eike F. Schwier ; Hideaki Iwasawa ; Kenya Shimada ; Masaki Taniguchi ; Zhaohua Cheng ; Shuyun Zhou ; Shixuan Du ; Stephen J. Pennycook ; Sokrates T. Pantelides ; Hong-Jun Gao
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：June 10, 2015
• 年：2015
• 卷：15
• 期：6
• 页码：4013-4018
• 全文大小：338K
• ISSN：1530-6992

文摘

Single-layer transition-metal dichalcogenides (TMDs) receive significant attention due to their intriguing physical properties for both fundamental research and potential applications in electronics, optoelectronics, spintronics, catalysis, and so on. Here, we demonstrate the epitaxial growth of high-quality single-crystal, monolayer platinum diselenide (PtSe₂), a new member of the layered TMDs family, by a single step of direct selenization of a Pt(111) substrate. A combination of atomic-resolution experimental characterizations and first-principle theoretic calculations reveals the atomic structure of the monolayer PtSe₂/Pt(111). Angle-resolved photoemission spectroscopy measurements confirm for the first time the semiconducting electronic structure of monolayer PtSe₂ (in contrast to its semimetallic bulk counterpart). The photocatalytic activity of monolayer PtSe₂ film is evaluated by a methylene-blue photodegradation experiment, demonstrating its practical application as a promising photocatalyst. Moreover, circular polarization calculations predict that monolayer PtSe₂ has also potential applications in valleytronics.