title: Epitaxial monolayer MoS2 on mica with novel photoluminescence.
abstract: Molybdenum disulfide (MoS2) is back in the spotlight because of the indirect-to-direct bandgap tunability and valley related physics emerging in the monolayer regime. However, rigorous control of the monolayer thickness is still a huge challenge for commonly utilized physical exfoliation and chemical synthesis methods. Herein, we have successfully grown predominantly monolayer MoS2 on an inert and nearly lattice-matching mica substrate by using a low-pressure chemical vapor deposition method. The growth is proposed to be mediated by an epitaxial mechanism, and the epitaxial monolayer MoS2 is intrinsically strained on mica due to a small adlayer-substrate lattice mismatch (~2.7%). Photoluminescence (PL) measurements indicate strong single-exciton emission in as-grown MoS2 and room-temperature PL helicity (circular polarization ~0.35) on transferred samples, providing straightforward proof of the high quality of the prepared monolayer crystals. The homogeneously strained high-quality monolayer MoS2 prepared in this study could competitively be exploited for a variety of future applications.
authors.affiliation: Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Ji
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Zhang
authors.forename: Teng
authors.initials: T
authors.lastname: Gao
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Donglin
authors.initials: D
authors.lastname: Ma
authors.forename: Mengxi
authors.initials: M
authors.lastname: Liu
authors.forename: Yubin
authors.initials: Y
authors.lastname: Chen
authors.forename: Xiaofen
authors.initials: X
authors.lastname: Qiao
authors.forename: Ping-Heng
authors.initials: PH
authors.lastname: Tan
authors.forename: Min
authors.initials: M
authors.lastname: Kan
authors.forename: Ji
authors.initials: J
authors.lastname: Feng
authors.forename: Qiang
authors.initials: Q
authors.lastname: Sun
authors.forename: Zhongfan
authors.initials: Z
authors.lastname: Liu