Development of Lead-free Ag2Te QDs-based Photodetector for SWIR Detection
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Recent advancements in autonomous driving and urban air mobility technologies have significantly increased the demand for infraredphotodetectors. Short-wave infrared (SWIR) imaging provides improved image resolution compared with that of near-infrared imagingowing to its lower scattering and higher transmittance characteristics. Conventional commercialized SWIR-band photodetectors, suchas InSb, Ge, HgCdTe, and InGaAs require complex manufacturing processes, resulting in high production costs and the need for additionalcooling devices. Therefore, research on alternative materials, such as quantum dots (QDs), for SWIR photodetection is crucial. QDs are particularly promising candidates as photoactive materials owing to their relatively simple processing requirements and exceptionalabsorption characteristics at specific wavelength bands. Ag2Te QDs do not contain heavy metals (Pb, Hg, etc.), thereby complyingwith the European directive Restriction of Hazardous Substances. This study synthesized lead-free Ag2Te QDs with an absorption peakat 1670 nm, which corresponds to the eye-safe band, and fabricated a high-sensitivity SWIR photodetector. Additionally, to enhance thesensitivity of the device, P3HT (Poly(3-hexylthiophene-2,5-diyl)) and ZnO nanoparticles were incorporated as hole/electron extractionlayers. As the results, the fabricated SWIR photodetector was confirmed to be capable of detecting an eye-safe wavelength laser of 1670nm with a responsivity of up to 184.2%.
Abstract
Recent advancements in autonomous driving and urban air mobility technologies have significantly increased the demand for infraredphotodetectors. Short-wave infrared (SWIR) imaging provides improved image resolution compared with that of near-infrared imagingowing to its lower scattering and higher transmittance characteristics. Conventional commercialized SWIR-band photodetectors, suchas InSb, Ge, HgCdTe, and InGaAs require complex manufacturing processes, resulting in high production costs and the need for additionalcooling devices. Therefore, research on alternative materials, such as quantum dots (QDs), for SWIR photodetection is crucial. QDs are particularly promising candidates as photoactive materials owing to their relatively simple processing requirements and exceptionalabsorption characteristics at specific wavelength bands. Ag2Te QDs do not contain heavy metals (Pb, Hg, etc.), thereby complyingwith the European directive Restriction of Hazardous Substances. This study synthesized lead-free Ag2Te QDs with an absorption peakat 1670 nm, which corresponds to the eye-safe band, and fabricated a high-sensitivity SWIR photodetector. Additionally, to enhance thesensitivity of the device, P3HT (Poly(3-hexylthiophene-2,5-diyl)) and ZnO nanoparticles were incorporated as hole/electron extractionlayers. As the results, the fabricated SWIR photodetector was confirmed to be capable of detecting an eye-safe wavelength laser of 1670nm with a responsivity of up to 184.2%.
참고문헌 (13)
- J. F. Klem, "Mesa-isolated InGaAs photodetectors with low dark current", Appl. Phys. Lett., 95(3), pp.031112(1)~031112(3) (2009)
- A. De Iacovo, "PbS Colloidal Quantum Dot Photodetectors operating in the near infrared", Sci. Rep., 6(1), pp.37913(1)~37913(9) (2016)
- H. T. Choi, "Zero-dimensional PbS quantum dot–InGaZnO film heterostructure for short-wave infrared flat-panel imager", ACS Photonics, 7(8), pp.1932~1941 (2020)
- F. Cao, "Short-wave infrared photodetector", Mater. Today, 62, pp.327~349 (2022)
- 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(1)~2201897(10) (2023)
- 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(1)~2003397(20) (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)
- G. N. Ankah, "PbS quantum dot based hybrid-organic photodetectors for X-ray sensing", Org. Electron., 33, pp.201~206 (2016)
- H. Yang, "Au-Doped Ag2Te Quantum Dots with Bright NIR-IIb Fluorescence for In Situ Monitoring of Angiogenesis and Arteriogenesis in a Hindlimb Ischemic Model", Adv. Mater., 33(1), pp.2103953(1)~2103953(18) (2021)
- J. Ouyang, "Ag2Te Colloidal Quantum Dots for Near-Infrared-II Photodetectors", ACS Appl. Nano Mater., 4(12), pp.1~10 (2021)
- Y. Wang, "Silver telluride colloidal quantum dot infrared photodetectors and image sensors", Nature, 18(1), pp.236~242 (2024)