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KIM, Jung Hwa
다차원 탄소재료 연구단
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Polytypism in few-layer gallium selenide

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Title
Polytypism in few-layer gallium selenide
Author(s)
Soo Yeon Lim; Jae-Ung Lee; Jung Hwa Kim; Liangbo Liang; Xiangru Kong; Thi Thanh Huong Nguyen; Zonghoon Lee; Sunglae Cho; Hyeonsik Cheong
Subject
LATTICE-VIBRATIONS, ; RAMAN-SCATTERING, ; BAND-GAP, ; CRYSTAL-STRUCTURE, ; HIGH-PERFORMANCE, ; GASE, ; STACKING, ; MODES, ; GRAPHENE, ; SHEAR
Publication Date
2020-04
Journal
NANOSCALE, v.12, no.15, pp.8563 - 8573
Publisher
ROYAL SOC CHEMISTRY
Abstract
© 2020 The Royal Society of Chemistry. Gallium selenide (GaSe) is one of the layered group-III metal monochalcogenides, which has an indirect bandgap in the monolayer and a direct bandgap in bulk unlike other conventional transition metal dichalcogenides (TMDs) such as MoX2 and WX2 (X = S and Se). Four polytypes of bulk GaSe, designated as β-, ϵ-, γ-, and δ-GaSe, have been reported. Since different polytypes result in different optical and electrical properties even with the same thickness, identifying the polytype is essential in utilizing this material for various optoelectronic applications. We performed polarized Raman measurements on GaSe and found different ultra-low-frequency Raman spectra of inter-layer vibrational modes even with the same thickness due to different stacking sequences of the polytypes. By comparing the ultra-low-frequency Raman spectra with the theoretical calculations and high-resolution electron microscopy measurements, we established the correlation between the ultra-low-frequency Raman spectra and the stacking sequences of trilayer GaSe. We further found that the AB-type stacking is more stable than the AA′-type stacking in GaSe
URI
https://pr.ibs.re.kr/handle/8788114/8679
DOI
10.1039/d0nr00165a
ISSN
2040-3364
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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