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Optically active heterostructures of graphene and ultrathin MoS2

Roy, Kallol and Padmanabhan, Medini and Goswami, Srijit and Sai, Phanindra T and Kaushal, Sanjeev and Ghosh, Arindam (2013) Optically active heterostructures of graphene and ultrathin MoS2. In: SOLID STATE COMMUNICATIONS, 175 (SI). pp. 35-42.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2013.09.021


Here we present the fabrication and characterization of a new class of hybrid devices where the constituents are graphene and ultrathin molybdenum di-sulphide (MoS2). This device is one of the simplest member of a family of hybrids where the desirable electrical characteristics of graphene such as high mobility are combined with optical activity of semiconductors. We find that in the presence of an optically active substrate, considerable photoconductivity is induced in graphene which is persistent up to a time scale of at least several hours. This photo induced memory can be erased by the application of a suitable gate voltage pulse. This memory operation is stable for many cycles. We present a theoretical model based on localized states in MoS2 which explains the data. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Keywords: Graphene; Molybdenum disulfide; Heterostructure; Photoconductivity
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 17 Feb 2014 11:01
Last Modified: 17 Feb 2014 11:01
URI: http://eprints.iisc.ac.in/id/eprint/48387

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