Growth of highly crystalline ultrathin two-dimensional selenene

Sarma, PV and Nadarajan, R and Kumar, R and Patinharayil, RM and Biju, N and Narayanan, S and Gao, G and Tiwary, CS and Thalakulam, M and Kini, RN and Singh, AK and Ajayan, PM and Shaijumon, MM (2022) Growth of highly crystalline ultrathin two-dimensional selenene. In: 2D Materials, 9 (4).

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Abstract

Elemental two-dimensional (2D) crystals have recently emerged as promising materials for advanced electronics and optoelectronics applications. However, it remains challenging to achieve controllable growth of high-quality, ultra-thin flakes of elemental 2D materials. Here, we demonstrate, for the first time, a seed-assisted chemical vapor transport growth of ultra-thin triangular flakes of highly crystalline trigonal selenium (t-Se) oriented in (0001) direction, with lateral size >30 μm. The polarization angle-resolved Raman spectra of bilayer selenene show in-plane isotropic properties, owing to the highly symmetric lattice resulting from its unique growth orientation. Density functional theory calculations support the experimental findings in establishing the structure and stability of the as-grown selenene. We studied the optical response of a photodetector fabricated using a bilayer selenene. Our growth strategy can be extended to other elemental 2D materials to realize their full potential in applications ranging from optoelectronics and electronics to energy conversion.

Item Type:	Journal Article
Publication:	2D Materials
Publisher:	Institute of Physics
Additional Information:	The copyright for this article belongs to the Institute of Physics.
Keywords:	Density functional theory; Selenium compounds; Transport properties, Advanced Electronics; Bi-layer; Chemical Vapour Transport; Electronics applications; Elemental 2d material; Photoresponses; Selenene; Two-dimensional; Two-dimensional (2D) crystals; Ultra-thin, Energy conversion
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	27 Jul 2022 10:52
Last Modified:	27 Jul 2022 10:52
URI:	https://eprints.iisc.ac.in/id/eprint/74987

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