Fast Photoresponse from 1T Tin Diselenide Atomic Layers
Author
Yu, Peng
Yu, Xuechao
Lu, Wanglin
Lin, Hsin
Sun, Linfeng
Du, Kezhao
Liu, Fucai
Fu, Wei
Zeng, Qingsheng
Shen, Zexiang
Jin, Chuanhong
Wang, Qi Jie
Liu, Zheng
Date of Issue
2015School
School of Electrical and Electronic Engineering
School of Materials Science and Engineering
School of Physical and Mathematical Sciences
School of Materials Science and Engineering
School of Physical and Mathematical Sciences
Version
Accepted version
Abstract
Atomically layered 2D crystals such as transitional metal dichalcogenides (TMDs) provide an enchanting landscape for optoelectronic applications due to their unique atomic structures. They have been most intensively studied with 2H phase for easy fabrication and manipulation. 1T phase material could possess better electrocatalytic and photocatalytic properties, while they are difficult to fabricate. Herein, for the first time, the atomically layered 1T phase tin diselenides (SnSe2, III-IV compound) are successfully exfoliated by the method of mechanical exfoliation from bulk single crystals, grown via the chemical vapor transport method without transport gas. More attractively, the high performance atomically layered SnSe2 photodetector has been first successfully fabricated, which displays a good responsivity of 0.5 A W−1 and a fast photoresponse down to ≈2 ms at room temperature, one of the fastest response times among all types of 2D photodetectors. It makes SnSe2 a promising candidate for high performance optoelectronic devices. Moreover, high performance bilayered SnSe2 field-effect transistors are also demonstrated with a mobility of ≈4 cm2 V−1 s−1 and an on/off ratio of 103 at room temperature. The results demonstrate that few layered 1T TMD materials are relatively stable in air and can be exploited for various electrical and optical applications.
Subject
2D materials
photodetector
photodetector
Type
Journal Article
Series/Journal Title
Advanced Functional Materials
Rights
© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the author created version of a work that has been peer reviewed and accepted for publication by Advanced Functional Materials, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1002/adfm.201503789].
http://dx.doi.org/10.1002/adfm.201503789
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