Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Shortwave Infrared Photodetector based on PbS Quantum Dots for Eye-Safety Lidar Sensors

Eye safety 라이다 센서용 황화납 양자점 기반 SWIR photodetector 개발

  • Suji Choi (Advanced mechatronics R&D Group, Korea Institute of Industry Technology) ;
  • JinBeom Kwon (Advanced mechatronics R&D Group, Korea Institute of Industry Technology) ;
  • Yuntae Ha (Advanced mechatronics R&D Group, Korea Institute of Industry Technology) ;
  • Daewoong Jung (Advanced mechatronics R&D Group, Korea Institute of Industry Technology)
  • Received : 2023.08.07
  • Accepted : 2023.08.23
  • Published : 2023.09.30
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Abstract

Recently, the demand for lidar systems for autonomous driving is increasing, and research on Shortwave Infrared(SWIR) photodetectors for this purpose is being actively conducted. Most SWIR photodetectors currently being developed are based on InGaAs, and have the disadvantages of complex processes, high prices, and limitations in research due to monopoly. In addition, current SWIR photodetectors use lasers in the 905 nm wavelength band, which can pass through the pupil and cause damage to the retina. Therefore, it is required to develop a SWIR photodetector using a wavelength band of 1400 nm or more to be safe for human eyes, and to develop a material that can replace the proprietary InGaAs. PbS QDs are group 4-6 compound semiconductors whose absorption wavelength band can be adjusted from 1000 to 2700 nm, and have the advantage of being simple to process. Therefore, in this study, PbS QDs having an absorption wavelength peak of 1415 nm were synthesized, and a SWIR photodetector was fabricated using this. In addition, the photodetector's responsivity was improved by applying P3HT and ZnO NPs to improve electron hole mobility. As a result of the experiment, it was confirmed that the synthesized PbS QDs had excellent FWHM characteristics compared to commercial PbS QDs, and it was confirmed that the photodetector had a maximum current change of about 1.6 times.

Keywords

Acknowledgement

본 논문은 한국생산기술연구원 기본사업 "차세대 에너지원 수소(H2), 암모니아(NH3)의 누출 감지 변색성 소재 및 센서 개발(Kitech UI-23-0004)" 지원으로 수행한 연구입니다. 이 논문은 2020년도 정부(과학기술정보통신부)의 재원으로 연구개발특구진흥재단의지원을받아수행된연구임(2020-DD-UP0348). 본 연구는 중소벤처기업부와 중소기업기술정보진흥원의 "지역특화산업육성+(R&D, S3366018)"사업의 지원을 받아 수행된 연구결과임.

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