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Issue 4, 2019
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Ultra-sensitive graphene–bismuth telluride nano-wire hybrids for infrared detection

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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 (Bi2Te3), 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 Bi2Te3 nano-wires. These hybrid devices show an ultra-high sensitivity of ∼106 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 ∼1011 Jones respectively, which are comparable to those of some of the best known detectors.

Graphical abstract: Ultra-sensitive graphene–bismuth telluride nano-wire hybrids for infrared detection

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Publication details

The article was received on 18 Oct 2018, accepted on 03 Jan 2019 and first published on 04 Jan 2019


Article type: Communication
DOI: 10.1039/C8NR08433E
Nanoscale, 2019,11, 1579-1586

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

    S. Islam, J. K. Mishra, A. Kumar, D. Chatterjee, N. Ravishankar and A. Ghosh, Nanoscale, 2019, 11, 1579
    DOI: 10.1039/C8NR08433E

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