Dr. Xin Tang Profile

Dr. Xin Tang

at James Franck Institute

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Publications (2)

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Proceedings Article | 12 March 2020 Paper

Flexible infrared electronic eyes for multispectral imaging with colloidal quantum dots

Xin Tang, Matthew Ackerman, Philippe Guyot-Sionnest

Proceedings Volume 11441, 114410E (2020) https://doi.org/10.1117/12.2547691

KEYWORDS: Infrared imaging, Infrared radiation, Multispectral imaging, Quantum dots, Sensors, Mid-IR, Short wave infrared radiation, Infrared detectors, Staring arrays, Semiconductors

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Flexible infrared detectors with multispectral imaging capability are attracting great interest with increasing demand for sensitive, low-cost and scalable devices that can distinguish coincident spectral information and achieve wide field of view, low aberrations, and simple imaging optics at the same time. However, the widespread use of such detectors is still limited by the high cost of epitaxial semiconductors like HgCdTe, InSb, and InGaAs. In contrast, the solution-processability, mechanical flexibility and wide spectral tunability of colloidal quantum dots (CQDs) have inspired various inexpensive, high-performance optoelectronic devices covering important atmospheric windows from short-wave infrared (SWIR, 1.5 – 2.5 μm) to mid-wave infrared (MWIR 3 – 5 μm). Here, a potential route leading to flexible infrared electronic eyes with multispectral imaging capability is demonstrated by exploring HgTe CQDs photovoltaic detectors. At room temperature, the HgTe CQDs detectors demonstrate detectivity D* up to 6 × 10¹⁰ Jones in SWIR and 6.5 × 10⁸ Jones in MWIR. At cryogenic temperature, the MWIR D* becomes BLIP and increases to 1 × 10¹¹ Jones. Besides high D* , the HgTe CQDs detector shows fast response with rise time below 300 ns. By stacking CQDs with different energy gaps or coupling CQDs with tunable optical filters, dual-band and multi-band infrared detection can be achieved in wide spectral ranges. Finally, infrared images are captured with flexible HgTe CQDs detectors at varying bending curvatures, showing a practical approach to sensitive infrared electronic eyes beyond the visible range.

Proceedings Article | 9 September 2019 Presentation + Paper

Colloidal quantum dots based infrared electronic eyes for multispectral imaging

Xin Tang, Matthew Ackerman, Philippe Guyot-Sionnest

Proceedings Volume 11088, 1108803 (2019) https://doi.org/10.1117/12.2528595

KEYWORDS: Sensors, Quantum dots, Short wave infrared radiation, Mid-IR, Infrared radiation, Infrared imaging, Photodetectors, Absorption, Photovoltaic detectors, Multispectral imaging

Read Abstract +

Infrared multispectral imaging with curved focal plane array (FPA) is attracting great interest with increasing demand for sensitive, low-cost and scalable devices that can distinguish coincident spectral information and achieve wide field of view, low aberrations, and simple imaging optics at the same time. However, the widespread use of such detectors is still limited by the high cost of epitaxial semiconductors like HgCdTe, InSb, and InGaAs. In contrast, the solution-processability, mechanical flexibility and wide spectral tunability of colloidal quantum dots (CQDs) have inspired various inexpensive, high-performance optoelectronic devices covering important atmospheric windows from short-wave infrared (SWIR, 1.5 – 2.5 μm) to mid-wave infrared (MWIR 3 – 5 μm). Here, a potential route leading to infrared electronic eyes with multispectral imaging capability is demonstrated by exploring HgTe CQDs photovoltaic detectors. At room temperature, the HgTe CQDs detectors demonstrate detectivity D* up to 6 × 10¹⁰ Jones in SWIR and 6.5 × 10⁸ Jones in MWIR. At cryogenic temperature, the MWIR D* becomes BLIP and increases to 1 × 10¹¹ Jones. Besides high D* , the HgTe CQDs detector shows fast response with rise time below 300 ns. By stacking CQDs with different energy gaps or coupling CQDs with tunable optical filters, dual-band and multi-band infrared detection can be achieved in wide spectral ranges. Finally, infrared images are captured with flexible HgTe CQDs detectors at varying bending curvatures, showing a practical approach to sensitive infrared electronic eyes beyond the visible range.

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