Mercury Chalcogenide Quantum Dots for Infrared Detection
Philippe Guyot-Sionnest a
a The University of Chicago
Proceedings of Internet Conference for Quantum Dots (iCQD)
Online, Spain, 2020 July 14th - 17th
Organizers: Quinten Akkerman, Raffaella Buonsanti, Zeger Hens and Maksym Kovalenko
Invited Speaker, Philippe Guyot-Sionnest, presentation 056
Publication date: 3rd July 2020

Infrared photodetection is an interesting research and applications area for colloidal quantum dot.  Within the present technology, photon detection with infrared epitaxial materials is very expensive while bolometric detection suffers from lower sensitivity and speed.  CQDs, with wide spectral tunability, molecularly passivated surfaces, high throughput fabrication and direct coating of silicon read-out chips, could change the infrared technology.   Pioneering work on PbS and HgTe quantum dots showed early promises, and commercialization of PbS CQD imaging systems started. Raising the performance drives exciting research on many generic issues of colloidal quantum dots, including size and shape control, surface passivation, mobility, doping, non-radiative processes, Auger relaxation, etc. 

HgTe is a zero-gap bulk semiconductor and therefore CQDs cover the full infrared.  After a brief introduction, I will motivate the photovoltaic detection scheme and present the performances achieved in eSWIR and MWIR.   Then I will present avenues for further improvements as well as simple fundamental limits.  At the end, I will present innovative sensor fabrications that vastly benefit from the liquid processing.
© Fundació Scito
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