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나노 구조 물리 연구단
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Chain Vacancies in 2D Crystals

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Title
Chain Vacancies in 2D Crystals
Author(s)
Jiong Zhao; Honggi Nam; Thuc Hue Ly; Seok Joon Yun; Sera Kim; Suyeon Cho; Heejun Yang; Young Hee Lee
Publication Date
2017-01
Journal
SMALL, v.13, no.1, pp.1601930-1 - 1601930-10
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Defects in bulk crystals can be classified into vacancies, interstitials, grain boundaries, stacking faults, dislocations, and so forth. In particular, the vacancy in semiconductors is a primary defect that governs electrical transport. Concentration of vacancies depends mainly on the growth conditions. Individual vacancies instead of aggregated vacancies are usually energetically more favorable at room temperature because of the entropy contribution. This phenomenon is not guaranteed in van der Waals 2D materials due to the reduced dimensionality (reduced entropy). Here, it is reported that the 1D connected/aggregated vacancies are energetically stable at room temperature. Transmission electron microscopy observations demonstrate the preferential alignment direction of the vacancy chains varies in different 2D crystals: MoS2 and WS2 prefer < <(2)over bar>11> direction, while MoTe2 prefers < <(1)over bar>10> direction. This difference is mainly caused by the different strain effect near the chalcogen vacancies. Black phosphorous also exhibits directional double- chain vacancies along < 01> direction. Density functional theory calculations predict that the chain vacancies act as extended gap (conductive) states. The observation of the chain vacancies in 2D crystals directly explains the origin of n-type behavior in MoTe2 devices in recent experiments and offers new opportunities for electronic structure engineering with various 2D materials © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/3506
ISSN
1613-6810
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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