journal article·2020-06-23Open access

Hexagonal Boron Nitride Single Crystal Growth from Solution with a Temperature Gradient

Jiahan Li, Chao Yuan, Christine Elias, Junyong Wang, Xiaotian Zhang, Gaihua Ye, Chaoran Huang, Martin Kuball, Goki Eda, Joan M. Redwing, Rui He, Guillaume Cassabois, Bernard Gil, Pierre Valvin, Thomas Pelini, Bin Liu, James H. Edgar

Chemistry of Materials· Volume 32· Issue 12

Abstract

Hexagonal boron nitride (hBN) is attracting much attention due to its tremendous applications including nanophotonic and electronic devices, substrates for two-dimensional (2D) materials, heat management materials, etc. To achieve the best device performance, large area hBN single crystals are required. Herein, large-area (>500 μm each), high-quality (defect density < 0.52/μm2) bulk hBN single crystals are grown from molten metal solutions with a temperature gradient. The narrow Raman line widths of the intralayer E2g mode peak and the interlayer shear mode, the strong and sharp phonon-assisted transition photoluminescence peaks, and the high thermal conductivity demonstrate that the hBN produced by this method has a high crystal quality with a low density of defects. Atomic force microscope images show that atomically flat layers of hBN can be produced by exfoliation. This study not only demonstrates a new strategy for growing large hBN single crystals but also provides high quality thick and thin hBN layers for nanodevice applications.
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Research context

OpenAlex topics: Graphene research and applications · 2D Materials and Applications · Diamond and Carbon-based Materials Research

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

Affiliations

Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, United States

Center for Device Thermography and Reliability (CDTR), H. H. Wills Physics Laboratory, University of Bristol, BS8 1TL Bristol, United Kingdom

Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, Montpellier 34095, France

Department of Physics, National University of Singapore, 2 Science Drive 3, 117551 Singapore

Department of Materials Science and Engineering, 2D Crystal Consortium, Materials Innovation Platform, The Pennsylvania State University, University Park, Pennsylvania 16802, United States

Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, United States

Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, 117546, Singapore

Department of Chemistry, National University of Singapore, 3 Science Drive 3,117543, Singapore

Funding

Division of Chemistry · Ministry of Education - Singapore · National Research Foundation Singapore · Division of Civil, Mechanical and Manufacturing Innovation · Division of Materials Research

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