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Room-temperature mid-infrared sensors using colloidal quantum dots

Project description

More practical and affordable mid-infrared sensors

Mid-infrared sensors are essential for many applications including environmental monitoring, medical imaging and food analysis. However, current technologies are not practical as they rely on expensive and complex grown semiconductors and require cryogenic temperatures. Colloidal quantum dots (CQDs) offer a promising alternative owing to their low cost, ease of processing and compatibility with silicon technology. With the support of the Marie Skłodowska-Curie Actions programme, the MIRDOT project aims to develop cost-effective, high-performance mid-infrared sensors that work at room temperature. The innovation lies in upconverting mid-infrared to near-infrared light so that it can be reliably detected with standard silicon detectors at room temperature. As a proof of concept, MIRDOT will develop mid-infrared imaging and gas sensors, pushing CQD technology into new spectral regions.

Objective

Mid-infrared (MIR) sensors are pivotal in enabling a broad range of applications, including environmental monitoring, medical imaging, safety, and food analysis. The current sensing technologies within this spectral range (λ= 3-30 μm) rely on high-cost and complex fabrications of epitaxially grown semiconductors. These sensors are not monolithic to silicon photonics and require cryogenic operating temperatures, limiting their adoption to the market. Alternatively, colloidal quantum dots (CQD) offer unique properties for sensing MIR light, including low-cost production, ease of processing, and silicon CMOS compatibility. The MIRDOT project will develop room-temperature (RT), cost-effective, and high-performance MIR sensors using CQD. So far, CQD technology has revolutionized the optoelectronics industry, particularly through the development of advanced sensors such as PbS CQD near-infrared (NIR) image sensors. These sensors leverage interband transitions in CQD, limiting their sensitivity to the NIR region. Intraband transitions in CQD, however, enable access to MIR region. Previously, doped PbS and HgTe CQDs have been investigated for MIR detection through intraband absorption. Nevertheless, these detectors exhibit extremely poor sensitivity at RT due to structural constraints and background noise in the MIR. In this project, I propose to effectively address these limitations by upconverting MIR radiation to NIR emission, enabling reliable detection with standard silicon detectors at RT. In this project, I will develop CQD-MIR sensors by coupling doped PbS(Se) CQD with extreme plasmonic nanocavities under optical pumping. To integrate these sensors with CMOS technology, I will design and fabricate electrically-driven sensors. Finally, as proof-of-concept phase, I aim to develop MIR imaging and gas sensors that operate at RT using these CQD-MIR sensors. The MIRDOT project will extend CQD technology into new spectral regions, greatly advancing future technologies.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

(opens in new window) HORIZON-MSCA-2024-PF-01

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Coordinator

THE CHANCELLOR MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
Net EU contribution
€ 276 187,92
Address
TRINITY LANE THE OLD SCHOOLS
CB2 1TN CAMBRIDGE
United Kingdom
Region
East of England East Anglia Cambridgeshire CC
Activity type
Higher or Secondary Education Establishments
Links
Total cost
No data