DataVXACS NanoPaper
journal article·2019-05-28Open access

Formation and Healing of Defects in Atomically Thin GaSe and InSe

David G. Hopkinson, Viktor Zólyomi, Aidan P. Rooney, Nick Clark, Daniel J. Terry, Matthew Hamer, David J. Lewis, Christopher S. Allen, Angus I. Kirkland, Yuri Andreev, Zakhar Kudrynskyi, Zakhar Kovalyuk, Amalia Patanè, Vladimir I. Fal’ko, Roman Gorbachev, Sarah J. Haigh

ACS Nano· Volume 13· Issue 5
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Source abstract

Abstract

Two dimensional III-VI metal monochalcogenide materials, such as GaSe and InSe, are attracting considerable attention due to their promising electronic and optoelectronic properties. Here, an investigation of point and extended atomic defects formed in mono-, bi-, and few-layer GaSe and InSe crystals is presented. Using state-of-the-art scanning transmission electron microscopy, it is observed that these materials can form both metal and selenium vacancies under the action of the electron beam. Selenium vacancies are observed to be healable: recovering the perfect lattice structure in the presence of selenium or enabling incorporation of dopant atoms in the presence of impurities. Under prolonged imaging, multiple point defects are observed to coalesce to form extended defect structures, with GaSe generally developing trigonal defects and InSe primarily forming line defects. These insights into atomic behavior could be harnessed to synthesize and tune the properties of 2D post-transition-metal monochalcogenide materials for optoelectronic applications.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Solid-state spectroscopy and crystallography · 2D Materials and Applications · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Graphene Institute, University of Manchester, Booth Street East, Manchester M13 9PL, United Kingdom

School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom

School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom

Electron Physical Sciences Imaging Centre, Diamond Light Source Ltd., Didcot, Oxfordshire OX11 0DE, United Kingdom

Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom

National Tomsk State Research University, 634050 Tomsk, Russian Federation

School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom

Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Chernivtsi Branch, 58001 Chernivtsi, Ukraine

Henry Royce Institute for Advanced Materials, Manchester M13 9PL, United Kingdom

Funding

Engineering and Physical Sciences Research Council · Royal Society · Leverhulme Trust · Defense Threat Reduction Agency · H2020 European Research Council · National Academy of Sciences of Ukraine

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