Eye safety 라이다 센서용 황화납 양자점 기반 SWIR photodetector 개발
Shortwave Infrared Photodetector based on PbS Quantum Dots for Eye-Safety Lidar Sensors
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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 basedon 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 damageto the retina. Therefore, it is required to develop a SWIR photodetector using a wavelength band of 1400 nm or more tobe safe for human eyes, and to develop a material that can replace the proprietary InGaAs. PbS QDs are group 4-6 compoundsemiconductors whose absorption wavelength band can be adjusted from 1000 to 2700 nm, and have the advantage of beingsimple to process. Therefore, in this study, PbS QDs having an absorption wavelength peak of 1415 nm were synthesized, anda SWIR photodetector was fabricated using this. In addition, the photodetector's responsivity was improved by applying P3HTand ZnO NPs to improve electron hole mobility. As a result of the experiment, it was confirmed that the synthesized PbS QDshad excellent FWHM characteristics compared to commercial PbS QDs, and it was confirmed that the photodetector had a maximumcurrent change of about 1.6 times.
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 basedon 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 damageto the retina. Therefore, it is required to develop a SWIR photodetector using a wavelength band of 1400 nm or more tobe safe for human eyes, and to develop a material that can replace the proprietary InGaAs. PbS QDs are group 4-6 compoundsemiconductors whose absorption wavelength band can be adjusted from 1000 to 2700 nm, and have the advantage of beingsimple to process. Therefore, in this study, PbS QDs having an absorption wavelength peak of 1415 nm were synthesized, anda SWIR photodetector was fabricated using this. In addition, the photodetector's responsivity was improved by applying P3HTand ZnO NPs to improve electron hole mobility. As a result of the experiment, it was confirmed that the synthesized PbS QDshad excellent FWHM characteristics compared to commercial PbS QDs, and it was confirmed that the photodetector had a maximumcurrent change of about 1.6 times.
참고문헌 (10)
- F. Cao, "Short-wave infrared photodetector", Mater. Today, 62, pp.327~349 (2022)
- J. F. Klem, "Mesa-isolated InGaAs photodetectors with low dark current", Appl. Phys. Lett, 95(3), pp.341~315 (2009)
- A. D. Iacovo, "PbS Colloidal Quantum Dot Photodetectors operating in the near infrared", Sci. Rep, 6(1), pp.37913~ (2016)
- S. M. Swasey, "High throughput near infrared screening discovers DNA-templated silver clusters with peak fluorescence beyond 950 nm", Nanoscale, 10(42), pp.19701~19705 (2018)
- U. Bothra, "Impact of Ligands on the Performance of PbS Quantum Dot Visible–Near‐Infrared Photodetectors", Adv. Opt. Mater., 11(1), pp.2201897~ (2023)
- H. T. Choi, "Zero-dimensional PbS quantum dot–InGaZnO film heterostructure for short-wave infrared flatpanel imager", ACS Photonics, 7(8), pp.1932~1941 (2020)
- W. Chen, "Spray-deposited PbS colloidal quantum dot solid for near-infrared photodetectors", Nano Energy, 78, pp.105254~ (2020)
- K. Xu, "Integrated structure and device engineering for high performance and scalable quantum dot infrared photodetectors", Small, 16(47), pp.2003397~ (2020)
- Y. Fang, "Large gain, low noise nanocomposite ultraviolet photodetectors with a linear dynamic range of 120 dB", Adv. Opt. Mater., 2(4), pp.348~353 (2014)
- Ankah, "PbS quantum dot based hybrid-organic photodetectors for X-ray sensing", Org. Electron, 33, pp.201~206 (2016)