Colloidal quantum dots for mid-IR applications

Emmanuel Lhuillier (1) , Sean Keuleyan (2, 1) , Philippe Guyot-Sionnest (1)

1 James Franck Institute
2 University of Oregon [Eugene]

The use of colloidal material offers an interesting alternative to top down approaches for the realization of low cost infrared detectors. We demonstrate photoconduction in thin films of a colloidal material in the mid-infrared (up to 7 μm), using HgTe colloidal quantum dots. Thin films of the colloidal quantum dots have a large absorption coefficient (>104 cm−1), and the photoconductive response is dramatically improved by encapsulating the nanoparticle into an inorganic matrix of As2S3. Such devices show fast response and large detectivity (>1010 jones) at temperatures above 200 K.

Mots clés: quantum dot; Hgte; mid infrared; HgTe; mid-infrared

Domaines: Matériaux; Matière Condensée [cond-mat]

Emmanuel Lhuillier, Sean Keuleyan, Philippe Guyot-Sionnest. Colloidal quantum dots for mid-IR applications. QSIP, 2012, Cargese, France. pp.133 - 136, ⟨10.1016/j.infrared.2012.12.027⟩. ⟨hal-01438647⟩