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High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction
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High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction
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Journal Article
High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction
2023
Overview
Due to thermal carriers generated by a narrow mid-infrared energy gap, cooling is always necessary to achieve ideal photodetection. In quantum dot (QD), the electron thermal generation should be reduced with quantum confinement in all three dimensions. As a result, there would be a great potential to realize high-operating-temperature (HOT) QD mid-IR photodetectors, though not yet achieved. Taking the advantages of colloidal nanocrystals’ solution processability and precise doping control by surface dipoles, this work demonstrates a HOT mid-infrared photodetector with a QD gradient homojunction. The detector achieves background-limited performance with
D
*
= 2.7 × 10
11
Jones on 4.2 μm at 80 K, above 10
11
Jones until 200 K, above 10
10
Jones until 280 K, and 7.6 × 10
9
Jones on 3.5 μm at 300 K. The external quantum efficiency also achieves more than 77% with responsivity 2.7 A/W at zero bias. The applications such as spectrometers, chemical sensors, and thermal cameras, are also approved, which motivate interest in low-cost, solution-processed and high-performance mid-infrared photodetection beyond epitaxial growth bulk photodetectors.
Colloidal quantum dot gradient homojunction would effectively improve the detectivity of mid-infrared photodetector at high-operating temperatures, motivating interest in low-cost, solution-processed and high-performance mid-infrared photodetection.
Publisher
Nature Publishing Group UK,Springer Nature B.V,Nature Publishing Group
