[20p-221B-1~11] 4.5 Nanocarbon and 2D Materials

▲ [20p-221B-11] Optical properties of vertically stacked MoTe₂/WSe₂ heterostructure

〇Hong En Lim^1,2、Takao Yamaoka¹、Sandhaya Koirala¹、Xiaofan Wang¹、Keisuke Shinokita¹、Mina Maruyama³、Susumu Okada³、Yuhei Miyauchi¹、Kazunari Matsuda¹ (1.Kyoto Univ.、2.Tokyo Metropolitan Univ.、3.Univ. of Tsukuba)

キーワード：transition metal dichalcogenides, van der Waals heterostructure, Type I

Van der Waals heterostructures, which comprise layered materials of different kinds, are oftentimes favored as to harvest the advantages from each constituting components with improved functionalities. Transition metal dichalcogenide (TMDC)-based heterostructures especially, have generated much attention for their unique optical and electronic properties. TMDC-heterostructures of MoSe₂/WSe₂ and MoS₂/WSe₂ for instance, have shown longer valley lifetime that is potentially useful for spin/valleytronics application. Nonetheless, the majority of them forms a Type-II band alignment, where electrons and holes are confined at the separate layers. The TMDC-heterostructure with a Type-I band alignment, which is the fundamental model to many sophisticated semiconductor optoelectronic devices, remains less explored. Herein, we report the optical properties of a Type I heterostructure, realized using MoTe₂ and WSe₂.