Publication date: 15th May 2025
Single-element detectors (SEDs) with room temperature extended short wave infrared (eSWIR) photoresponse were fabricated with branched nanorods of HgTe. Nanorods with high aspect (length/width) ratios were obtained by using stoichiometric excesses of Hg (i.e., [Hg]:[Te] molar ratios greater than one) and relatively low reaction temperatures, as low as room temperature. The size-tunable optical cut-off wavelengths of the detectors ranged from 2-3.5 micrometers, with specific detectivities as high as 2.4 X 10^11 Jones. The devices retained their responsivity for more than a year. Branched nanorods of HgTe are promising materials for IR photodetectors and imagers.
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