Overview
Colloidal quantum dot IR photodetectors are composed of a thin film of colloidal quantum dots sandwiched between two electrodes or complex photodiode stacks. When IR radiation is incident on the device, the quantum dots absorb the photons and create electron-hole pairs. These pairs can be collected by the electrodes and converted into an electrical signal.
One of the advantages of using colloidal quantum dots is their tunability. By changing the size/surface of the quantum dots, the absorption wavelength can be tuned to match specific IR wavelengths.
IR Photodetection has its hands in many industries but is mainly driven by military, agricultural, autonomous navigation, quality control and space exploration.
Our group’s current focuses are in improving the performance of heavy metal free alternatives like Ag2Se. Improving the stack quality of HgTe photodiodes and understanding the stability issues inherent to environmental and electrical exposure in these devices.
One of the advantages of using colloidal quantum dots is their tunability. By changing the size/surface of the quantum dots, the absorption wavelength can be tuned to match specific IR wavelengths.
IR Photodetection has its hands in many industries but is mainly driven by military, agricultural, autonomous navigation, quality control and space exploration.
Our group’s current focuses are in improving the performance of heavy metal free alternatives like Ag2Se. Improving the stack quality of HgTe photodiodes and understanding the stability issues inherent to environmental and electrical exposure in these devices.
Equipment
Signal Analyzer: Used to measure QD IR Detector Sensitivity to Noise
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Cryostat: Can measure optical and electronic properties of thin films down to 80K
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Relevant Publications
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Electrospun Tri-Cation Perovskite Nanofibers for Infrared Photodetection
Kim, Min‐Woo, et al. "Electrospun Tri‐Cation Perovskite Nanofibers for Infrared Photodetection." Advanced Functional Materials 32.45 (2022): 2207326. DOI: https://doi.org/10.1002/adfm.202207326 |
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Origin of Intraband Optical Transitions in Ag2Se Colloidal Quantum Dots Michael R. Scimeca, Navkawal Mattu, Ingrid J. Paredes, Minh N. Tran, Shlok Joseph Paul, Eray S. Aydil, and Ayaskanta Sahu The Journal of Physical Chemistry C 2021 125 (31), 17556-17564 DOI: 10.1021/acs.jpcc.1c05371 |
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Facile Synthesis of Silver Chalcogenide (Ag2E; E = Se, S, Te) Semiconductor Nanocrystals Ayaskanta Sahu, Lejun Qi, Moon Sung Kang, Donna Deng, and David J. Norris Journal of the American Chemical Society 2011 133 (17), 6509-6512 DOI: 10.1021/ja200012e |
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Quantum confinement in silver selenide semiconductor nanocrystals Sahu, Ayaskanta, et al. "Quantum confinement in silver selenide semiconductor nanocrystals." Chemical Communications 48.44 (2012): 5458-5460. DOI: 10.1039/C2CC30539A |
Alumni
Nav Mattu | B.S. 3+2 Dual Degree Program in Chemistry and Chemical Engineering at NYU Graduated 2021 | LinkedIn
Mike Scimeca | Ph.D. Student in Chemical Engineering | Now at Veolia WTS
Peter Zhao | Visiting Undergraduate | Chemical Engineering at Cooper Union | LinkedIn
Mike Scimeca | Ph.D. Student in Chemical Engineering | Now at Veolia WTS
Peter Zhao | Visiting Undergraduate | Chemical Engineering at Cooper Union | LinkedIn
