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Chen M, Hao Q, Luo Y, Tang X. Mid-Infrared Intraband Photodetector via High Carrier Mobility HgSe Colloidal Quantum Dots. ACS NANO 2022; 16:11027-11035. [PMID: 35792103 DOI: 10.1021/acsnano.2c03631] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
In this work, a room-temperature mixed-phase ligand exchange method is developed to obtain a relatively high carrier mobility (∼1 cm2/(V s)) on HgSe intraband colloidal quantum dot solids without any observable trap state. What is more, the doping from 1Se to 1Pe state in the conduction band could be precisely controlled by additional salts during this method, proved by optical and transport experiments. The high mobility and controllable doping benefit the mid-infrared photodetector utilizing the 1Se to 1Pe transition, with a 1000-fold improvement in response speed, which is several μs, a 55-fold increase in responsivity, which is 77 mA/W, and a 10-fold increase in specific detectivity, which is above 1.7 × 109 Jones at 80 K. The high-performance photodetector could serve as an intraband infrared camera for thermal imaging, as well as a CO2 gas sensor with a range from 0.25 to 2000 ppm.
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Affiliation(s)
- Menglu Chen
- School of Optics and Photonics, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
- Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing, 100081, China
- Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, 314000, China
| | - Qun Hao
- School of Optics and Photonics, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
- Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing, 100081, China
- Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, 314000, China
| | - Yuning Luo
- School of Optics and Photonics, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Xin Tang
- School of Optics and Photonics, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
- Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing, 100081, China
- Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, 314000, China
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Biering S, Schwerdtfeger P. A comparative density functional study of the low pressure phases of solid ZnX, CdX, and HgX: Trends and relativistic effects. J Chem Phys 2012; 136:034504. [DOI: 10.1063/1.3675833] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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