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  • Title: Intraband Transition of HgTe Nanocrystals for Long-Wave Infrared Detection at 12 μm.
    Author: Zhang H, Peterson JC, Guyot-Sionnest P.
    Journal: ACS Nano; 2023 Apr 25; 17(8):7530-7538. PubMed ID: 37027314.
    Abstract:
    The synthesis of n-doped HgTe colloidal quantum dots was optimized to produce samples with a 1Se-1Pe intraband transition in the long-wave infrared (8-12 μm). The spin-orbit splitting of 1Pe states places the 1Se-1Pe1/2 transition around 10 μm. The narrow line width of 130 cm-1 at 300 K is limited by the size distribution. This narrowing leads to an absorption coefficient about 5 times stronger than is possible with the HgTe CQD interband transition at similar energies. From 300 to 80 K, the intraband transition blueshifts by 90 cm-1, while the interband transition redshifts by 350 cm-1. These shifts are assigned to the temperature dependence of the band structure. With ∼2 electrons/dot doping at 80 K, a photoconductive film of 80 nm thickness on a quarter wave reflector substrate showed a detectivity (D*) of ∼107 Jones at 500 Hz in the 8-12 μm range.
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