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Metasurface Colloidal Quantum Dot Photodetectors

Design, fabrication, and characterization of metasurface-enhanced photodetectors and photodiodes using colloidal quantum dots.

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Abstract:

“Efficient photodetectors that can be easily engineered for a specific spectral window are of high interest. Here, we report on the design, fabrication, and characterization of metasurface-enhanced photodetectors and photodiodes using colloidal quantum dots. We fabricate photoconductors optimized for the wavelength range around 1550 nm featuring responsivities of up to 8000 A/W with low noise equivalent powers on the order of tens of . Further, we produce photodiodes with responsivities of ∼5 mA/W that offer faster responses (14 μs rise time). The high responsivities are due to the metasurface, which increases the absorption by a factor of 10 compared to that of a quantum dot thin film of the same thickness and a structure that enables a photo-gain. We introduce a metasurface to detect either of the two orthogonal polarizations. The fabricated photoconductors operate at low voltages (1–5 V), making them compatible with the complementary metal-oxide-semiconductor (CMOS) read-out circuitry.”

Find the technical paper here.

Publication Date:January 24, 2022
https://doi.org/10.1021/acsphotonics.1c01204



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