光电探测器
量子点
光电二极管
制作
光电子学
吸收(声学)
材料科学
量子效率
半导体
物理
光学
医学
替代医学
病理
复合材料
作者
Nikola Đorđević,Raphael Schwanninger,Maksym Yarema,Stefan M. Koepfli,Olesya Yarema,Yannick Salamin,Nolan Lassaline,Bojun Cheng,Nasser Yazdani,Alexander Dorodnyy,Yuriy Fedoryshyn,Vanessa Wood,Juerg Leuthold
出处
期刊:ACS Photonics
[American Chemical Society]
日期:2022-01-24
卷期号:9 (2): 482-492
被引量:11
标识
DOI:10.1021/acsphotonics.1c01204
摘要
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 pW/Hz. 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.
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