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Colloidal quantum dots intraband photodetectors.
Zhiyou Deng1, Kwang Seob Jeong, Philippe Guyot-Sionnest
1James Franck Institute , 929 East 57th Street, Chicago, Illinois 60637, United States.
ACS Nano
|October 25, 2014
Summary
This study demonstrates photoconductivity in mercury selenide (HgSe) colloidal quantum dots using infrared light. Optimized doping achieved high detectivity, showcasing potential for advanced infrared detectors.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Physics
Background:
- Colloidal quantum dots (CQDs) offer tunable optoelectronic properties.
- Intraband absorption in quantum dots is less explored for device applications compared to interband transitions.
Purpose of the Study:
- To demonstrate photoconductivity in HgSe CQDs using intraband electronic absorption.
- To optimize CQD doping for improved detector performance.
- To explore the potential of intraband transitions for infrared detection.
Main Methods:
- Synthesis of monodispersed HgSe CQDs.
- Illumination with radiation resonant with 1S(e)-1P(e) intraband electronic absorption (3-5 μm).
- Measurement of photoconductivity, dark current, photoluminescence, and detector properties.
Main Results:
- Photoconductivity observed in HgSe CQDs.
- Lowest dark current achieved with two electrons per dot doping.
- High detectivity of 8.5 × 10^8 Jones obtained at 80 K.
- Intraband photoluminescence observed.
Conclusions:
- Intraband photoresponse in CQDs can be harnessed for detector applications.
- HgSe CQDs show promise for infrared detection beyond traditional interband transitions.
- Optimized doping and understanding of electronic states are key for high-performance photodetectors.
Keywords:
colloidal quantum dotsinfrared photodetectorintraband absorptionintraband photoconductivitymercury selenide
