Ultra-sensitive graphene-bismuth telluride nano-wire hybrids for infrared detection

Islam, S and Mishra, JK and Kumar, A and Chatterjee, D and Ravishankar, N and Ghosh, A (2019) Ultra-sensitive graphene-bismuth telluride nano-wire hybrids for infrared detection. In: Nanoscale, 11 (4). pp. 1579-1586.

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Abstract

The myriad technological applications of infrared radiation sensors make the search for ultra-sensitive detectors extremely crucial. Materials such as bismuth telluride (Bi 2 Te 3 ), having a small bulk band gap of 0.17 eV, are ideal infrared detectors. However, due to the high recombination rate of photo-generated charge carriers in the bulk, the electrical response under optical illumination is typically very weak in these materials. We have circumnavigated this by sensitizing graphene with Bi 2 Te 3 nano-wires. These hybrid devices show an ultra-high sensitivity of ∼10 6 A W -1 , under incident electromagnetic radiation from 940 nm to 1720 nm. The theoretical limit of the noise equivalent power and specific detectivity in these devices are ∼10 -18 W Hz -1/2 and ∼10 11 Jones respectively, which are comparable to those of some of the best known detectors.

Item Type:	Journal Article
Publication:	Nanoscale
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry.
Keywords:	Electromagnetic waves; Energy gap; Graphene; Infrared detectors; Infrared radiation; Nanosensors; Nanowires; Tellurium compounds; Wire, Electrical response; Infrared detection; Noise equivalent power; Optical illumination; Specific detectivity; Technological applications; Ultra sensitive detectors; Ultra-high-sensitivity, Bismuth compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Physical & Mathematical Sciences > Physics
Date Deposited:	28 Nov 2022 07:06
Last Modified:	28 Nov 2022 07:06
URI:	https://eprints.iisc.ac.in/id/eprint/78084

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