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- Title
Mid-infrared HgTe colloidal quantum dot photodetectors.
- Authors
Keuleyan, Sean; Lhuillier, Emmanuel; Brajuskovic, Vuk; Guyot-Sionnest, Philippe
- Abstract
Today's infrared imaging devices are based on bulk and quantum-confined epitaxial materials and would benefit greatly from higher operating temperatures and lower cost. Imaging chips based on colloidal quantum dot technology could offer a convenient lower-cost alternative, but, to date, the spectral range of operation of colloidal quantum dots has been limited. In this Letter, we report colloidal HgTe quantum dot photodetectors with a room-temperature photoresponse beyond 5 µm, the longest interband absorption wavelength reported so far for colloidal materials. The photodetectors are fabricated from colloidal solutions, which are then drop-cast as thin films on electrodes. Operation covering the important atmospheric mid-wavelength infrared transparency window between 3 and 5 µm is demonstrated.
- Subjects
SEMICONDUCTOR nanocrystals; OPTOELECTRONIC devices; TRANSMISSION electron microscopy; QUANTUM efficiency; INFRARED imaging; SPECTRAL sensitivity
- Publication
Nature Photonics, 2011, Vol 5, Issue 8, p489
- ISSN
1749-4885
- Publication type
Article
- DOI
10.1038/nphoton.2011.142