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γ-GeSe: A New Hexagonal Polymorph from Group IV-VI Monochalcogenides

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Title
γ-GeSe: A New Hexagonal Polymorph from Group IV-VI Monochalcogenides
Author(s)
Sol Lee; Joong-Eon Jung; Han-gyu Kim; Yangjin Lee; Je Myoung Park; Jeongsu Jang; Sangho Yoon; Arnab Ghosh; Minseol Kim; Joonho Kim; Woongki Na; Jonghwan Kim; Hyoung Joon Choi; Hyeonsik Cheong; Kwanpyo Kim
Publication Date
2021-05-26
Journal
Nano Letters, v.21, no.10, pp.4305 - 4313
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society. All rights reserved.The family of group IV-VI monochalcogenides has an atomically puckered layered structure, and their atomic bond configuration suggests the possibility for the realization of various polymorphs. Here, we report the synthesis of the first hexagonal polymorph from the family of group IV-VI monochalcogenides, which is conventionally orthorhombic. Recently predicted four-atomic-thick hexagonal GeSe, so-called γ-GeSe, is synthesized and clearly identified by complementary structural characterizations, including elemental analysis, electron diffraction, high-resolution transmission electron microscopy imaging, and polarized Raman spectroscopy. The electrical and optical measurements indicate that synthesized γ-GeSe exhibits high electrical conductivity of 3 × 105 S/m, which is comparable to those of other two-dimensional layered semimetallic crystals. Moreover, γ-GeSe can be directly grown on h-BN substrates, demonstrating a bottom-up approach for constructing vertical van der Waals heterostructures incorporating γ-GeSe. The newly identified crystal symmetry of γ-GeSe warrants further studies on various physical properties of γ-GeSe.
URI
https://pr.ibs.re.kr/handle/8788114/11059
DOI
10.1021/acs.nanolett.1c00714
ISSN
1530-6984
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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