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Ultra-high sensitivity infra-red detection and temperature effects in a graphene-tellurium nanowire binary hybrid

Pradhan, Avradip and Roy, Ahin and Tripathi, Shalini and Som, Anirban and Sarkar, Depanjan and Mishra, Jayanta Kumar and Roy, Kallol and Pradeep, T and Ravishankar, N and Ghosh, Arindam (2017) Ultra-high sensitivity infra-red detection and temperature effects in a graphene-tellurium nanowire binary hybrid. In: NANOSCALE, 9 (27). pp. 9284-9290.

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Official URL: http://dx.doi.org/10.1039/c7nr01860f


The optoelectronic performance of hybrid devices from graphene and optically sensitive semiconductors exceeds conventional photodetectors due to a large in-built optical gain. Tellurium nanowire (TeNW), being a narrow direct band gap semiconductor similar to 0.65 eV), is as an excellent potential candidate for near infra-red NIR) detection. Here we demonstrate a new graphene-TeNW binary hybrid that exhibits a maximum photoresponsivity of similar to 10(6) A W-1 at 175 K in the NIR regime 920 nm-1720 nm), which exceeds the photoresponsivity of the most common NIR photodetectors. The resulting noise-equivalent power NEP) is as low as 2 x 10(-18) W Hz(-1/2), and the specific detectivity (D*) exceeds 5 x 10(13) cm Hz1/ 2 W-1 Jones). The temperature range of optimal operation, which extends up to approximate to 220 K and approximate to 260 K for 1720 nm and 920 nm excitation, respectively, is primarily limited by the electrical conductivity of the TeNW layer, and can further be improved by lowering of the defect density as well as inter-wire electronic coupling.

Item Type: Journal Article
Publication: NANOSCALE
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Aug 2017 10:18
Last Modified: 03 Aug 2017 10:18
URI: http://eprints.iisc.ac.in/id/eprint/57568

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