Colloidal HgTe Quantum Dot/Graphene Phototransistor with a Spectral Sensitivity Beyond 3 µm

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Date
2021-03-17Type
- Journal Article
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Cited 17 times in
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Cited 16 times in
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Abstract
Infrared light detection enables diverse technologies ranging from night vision to gas analysis. Emerging technologies such as low‐cost cameras for self‐driving cars require highly sensitive, low‐cost photodetector cameras with spectral sensitivities up to wavelengths of 10 µm. For this purpose, colloidal quantum dot (QD) graphene phototransistors offer a viable alternative to traditional technologies owing to inexpensive synthesis and processing of QDs. However, the spectral range of QD/graphene phototransistors is thus far limited to 1.6 µm. Here, HgTe QD/graphene phototransistors with spectral sensitivity up to 3 µm are presented, with specific detectivities of 6 × 108 Jones at a wavelength of 2.5 µm and a temperature of 80 K. Even at kHz light modulation frequencies, specific detectivities exceed 108 Jones making them suitable for fast video imaging. The simple device architecture and QD film patterning in combination with a broad spectral sensitivity manifest an important step toward low‐cost, multi‐color infrared cameras. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000475566Publication status
publishedExternal links
Journal / series
Advanced ScienceVolume
Pages / Article No.
Publisher
WileySubject
low‐temperature detectors; mercury telluride; photodetectors; phototransistors; QDsOrganisational unit
03934 - Kovalenko, Maksym / Kovalenko, Maksym
03462 - Poulikakos, Dimos / Poulikakos, Dimos
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Show all metadata
Citations
Cited 17 times in
Web of Science
Cited 16 times in
Scopus
ETH Bibliography
yes
Altmetrics