期刊
NANOSCALE
卷 11, 期 4, 页码 1579-1586出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr08433e
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- Department of Science and Technology, Government of India
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 similar to 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 similar to 10(-18) W Hz(-1/2) and similar to 10(11) Jones respectively, which are comparable to those of some of the best known detectors.
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