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journal article·2021-01Open access

Ultrathin Ga2O3 Glass: A Large‐Scale Passivation and Protection Material for Monolayer WS2

Matthias Wurdack, Tinghe Yun, Eliezer Estrecho, Nitu Syed, Semonti Bhattacharyya, Maciej Pieczarka, Ali Zavabeti, Shao‐Yu Chen, Benedikt Haas, Johannes Müller, Mark N. Lockrey, Qiaoliang Bao, Christian Schneider, Yuerui Lu, Michael S. Fuhrer, Andrew G. Truscott, Torben Daeneke, Elena A. Ostrovskaya

Advanced Materials· Volume 33· Issue 3
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Source abstract

Abstract

Abstract Atomically thin transition metal dichalcogenide crystals (TMDCs) have extraordinary optical properties that make them attractive for future optoelectronic applications. Integration of TMDCs into practical all‐dielectric heterostructures hinges on the ability to passivate and protect them against necessary fabrication steps on large scales. Despite its limited scalability, encapsulation of TMDCs in hexagonal boron nitride (hBN) currently has no viable alternative for achieving high performance of the final device. Here, it is shown that the novel, ultrathin Ga2O3 glass is an ideal centimeter‐scale coating material that enhances optical performance of the monolayers and protects them against further material deposition. In particular, Ga2O3 capping of monolayer WS2 outperforms commercial‐grade hBN in both scalability and optical performance at room temperature. These properties make Ga2O3 highly suitable for large‐scale passivation and protection of monolayer TMDCs in functional heterostructures.
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Research context

Ceramics & glassesElectronic materialsMaterials processing

OpenAlex topics: 2D Materials and Applications · Ga2O3 and related materials · Perovskite Materials and Applications

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

Affiliations

ARC Centre of Excellence in Future Low‐Energy Electronics Technologies and Nonlinear Physics Centre Research School of Physics The Australian National University Canberra ACT 2601 Australia

ARC Centre of Excellence in Future Low‐Energy Electronics Technologies and Department of Materials Science and Engineering Monash University Clayton Australia

Department of Chemical and Environmental Engineering RMIT University Melbourne VIC 3001 Australia

ARC Centre of Excellence in Future Low‐Energy Electronics Technologies and School of Physics and Astronomy Monash University Clayton VIC 3168 Australia

Department of Chemical Engineering The University of Melbourne Parkville VIC 3010 Australia

Institut fur Physik & IRIS Adlershof Humboldt‐Universität zu Berlin D‐10099 Berlin Germany

School of Mathematical and Physical Sciences University of Technology Sydney Ultimo NSW 2007 Australia

Department of Materials Science and Engineering Monash University Clayton Australia

Institut of Physics Carl von Ossietzky University of Oldenburg Ammerländer Heerstrasse 114‐118 26126 Oldenburg Germany

Technische Physik Wilhelm‐Conrad‐Röntgen Research Center for Complex Material Systems University of Würzburg Am Hubland D‐97074 Würzburg Germany

ARC Centre of Excellence in Future Low‐Energy Electronics Technologies and Research School of Electrical, Energy and Materials Engineering College of Engineering and Computer Science The Australian National University Canberra ACT 2601 Australia

Laser Physics Centre Research School of Physics The Australian National University Canberra ACT 2601 Australia

ARC Centre of Excellence in Future Low‐Energy Electronics Technologies and Department of Chemical and Environmental Engineering RMIT University Melbourne VIC 3001 Australia

Funding

Australian Research Council · European Research Council

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