Nanocrystal- based infrared sensor with by design light matter coupling

Nanocrystal- based infrared sensor with by design light matter coupling

Responsable : Emmanuel Lhuillier
Contact :
Tutelle : Sorbonne Université - CNRS
Mots clés : Experimental et Stage M2
Gratification : Oui
Page des stages de(s) l'équipe(s) : Physico-chimie et dynamique des surfaces
Description du stage

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Tradition infrared optoelectronic relies on epitaxially grown semiconductor which are highly energetic and with low thoughput method. Thus amlternative materials become of utmost interest. Nanocrystals are colloidally grown semiconductor and they have gain maturity over the last two decades [1]. A broad variety of material can be synthetized and atomic precision can be achieved. However, conduction in such granular material occurs through hopping which limit the carrier diffusion length. In other word, charge collecetion is only effcient over a few hundred of nm while the absorption depth is one order of magnitude longer. Thus, it becomes of utmost interest to couple thin nanocrystal thin film to efficiently absorb the light. Our group has been deeply investigated in this research direction over the past years and we now target to introduce new functionalities, such as broad band enhancement of the light absorption or reconfigurable spectral response (ie a response that can be tuned through bias application) [2-4]. Our long term goal also includes the transfer of such resonator at the camera level which add further technological constrains. [5]

The applicant will have in charge the design (electromagnetic simulation), the fabrication (clean room and glove box processing) as well as the device characterization. The project will be in collaboration with Onera for the electromagnetic design and with New Imaging technologies for the camera side.

Keywords: nanocrystals, device, infrared

Background : the applicant will have a background in semiconductor physics. Skills in clean room, programming or electrical measurements will be a plus but are not mandatory. The group being international, the applicant must speak english



[1] Mercury Chalcogenides Quantum Dots: a Material Perspective for Device Integration, C. Gréboval, et al Chem Rev 121, 3627 (2021).

[2] Near Unity Absorption in Nanocrystal Based Short Wave infrared Photodetector using Guided Mode Resonator, A. Chu et al, ACS Photonics 6, 10, 2553-2561 (2019)

[3] Broadband enhancement of mid-wave infrared absorption in a multi resonant device, T. H. Dang et al, Adv Opt Mater 10, 2200297 (2022).

[4] Guided mode resonator coupled with nanocrystal intraband absorption, A. Khalili et al, ACS Photonics 9, 985 (2022)

[5] Photoconductive focal plane array based on HgTe quantum dots for fast and cost-effective short-wave infrared imaging, C. Gréboval, et al, Nanoscale 14, 9359 (2022)