Voltage-Tunable Mid- and Long-Wavelength Dual-Band Infrared Photodetector Based on Hybrid Self-Assembled and Sub-Monolayer Quantum Dots

• Main Authors: Yao Zhai, Guiru Gu, Xuejun Lu
• Format: Article
• Language: English
• Published: MDPI AG 2018-12-01
• Series: Micromachines
• Subjects: submonolayer quantum dots; self-assembled quantum dot; dual-band midwave and longwave infrared photodetector; voltage tunable detection spectrum
• Online Access: http://www.mdpi.com/2072-666X/10/1/4
• ISSN: 2072-666X

In this paper, we report a mid-wave infrared (MWIR) and long-wave infrared (LWIR) dual-band photodetector capable of voltage-controllable detection band selection. The voltage-tunable dual-band photodetector is based on the multiple stacks of sub-monolayer (SML) quantum dots (QDs) and self-assembled QDs. By changing the photodetector bias voltages, one can set the detection band to be MWIR, or LWIR or both with high photodetectivity and low crosstalk between the bands.