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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Silver Telluride Colloidal Quantum Dot Solid for Fast Extended Shortwave Infrared Photodetector
https://orcid.org/0000-0001-6997-3642
https://orcid.org/0000-0003-4675-7108
https://orcid.org/0000-0001-5637-2733
https://orcid.org/0000-0003-3246-7599
https://orcid.org/0000-0002-5197-0598
AbstractExtended shortwave infrared (eSWIR) photodetectors that employ solution‐processable semiconductors have attracted attention for use in applications such as ranging, night vision, and gas detection. Colloidal quantum dots (CQDs) are promising materials with facile bandgap tunability across the visible‐to‐mid‐infrared wavelengths. However, toxic elements, such as Hg and Pb, and the slow response time of CQD‐based IR photodetectors, limit their commercial viability. This article presents a novel eSWIR photodetector that is fabricated using silver telluride (Ag2Te) CQDs. Effective thiolate ligand exchange enables a lower trap density and improved carrier mobility in CQD solids. Furthermore, a vertical p‐n photodiode architecture with a favorable energy‐level landscape is utilized to facilitate charge extraction, resulting in a fast, room‐temperature‐operable, and toxic‐element‐free CQD photodetector. The best eSWIR Ag2Te CQD photodetector exhibits a fall time of 72 ns, representing the fastest response time among all prior CQD‐based eSWIR photodetectors, including those containing toxic elements, such as Pb and Hg.
Silver Telluride Colloidal Quantum Dot Solid for Fast Extended Shortwave Infrared Photodetector
https://orcid.org/0000-0001-6997-3642
https://orcid.org/0000-0003-4675-7108
https://orcid.org/0000-0001-5637-2733
https://orcid.org/0000-0003-3246-7599
https://orcid.org/0000-0002-5197-0598
AbstractExtended shortwave infrared (eSWIR) photodetectors that employ solution‐processable semiconductors have attracted attention for use in applications such as ranging, night vision, and gas detection. Colloidal quantum dots (CQDs) are promising materials with facile bandgap tunability across the visible‐to‐mid‐infrared wavelengths. However, toxic elements, such as Hg and Pb, and the slow response time of CQD‐based IR photodetectors, limit their commercial viability. This article presents a novel eSWIR photodetector that is fabricated using silver telluride (Ag2Te) CQDs. Effective thiolate ligand exchange enables a lower trap density and improved carrier mobility in CQD solids. Furthermore, a vertical p‐n photodiode architecture with a favorable energy‐level landscape is utilized to facilitate charge extraction, resulting in a fast, room‐temperature‐operable, and toxic‐element‐free CQD photodetector. The best eSWIR Ag2Te CQD photodetector exhibits a fall time of 72 ns, representing the fastest response time among all prior CQD‐based eSWIR photodetectors, including those containing toxic elements, such as Pb and Hg.
Silver Telluride Colloidal Quantum Dot Solid for Fast Extended Shortwave Infrared Photodetector
https://orcid.org/0000-0001-6997-3642
https://orcid.org/0000-0003-4675-7108
https://orcid.org/0000-0001-5637-2733
https://orcid.org/0000-0003-3246-7599
https://orcid.org/0000-0002-5197-0598
AbstractExtended shortwave infrared (eSWIR) photodetectors that employ solution‐processable semiconductors have attracted attention for use in applications such as ranging, night vision, and gas detection. Colloidal quantum dots (CQDs) are promising materials with facile bandgap tunability across the visible‐to‐mid‐infrared wavelengths. However, toxic elements, such as Hg and Pb, and the slow response time of CQD‐based IR photodetectors, limit their commercial viability. This article presents a novel eSWIR photodetector that is fabricated using silver telluride (Ag2Te) CQDs. Effective thiolate ligand exchange enables a lower trap density and improved carrier mobility in CQD solids. Furthermore, a vertical p‐n photodiode architecture with a favorable energy‐level landscape is utilized to facilitate charge extraction, resulting in a fast, room‐temperature‐operable, and toxic‐element‐free CQD photodetector. The best eSWIR Ag2Te CQD photodetector exhibits a fall time of 72 ns, representing the fastest response time among all prior CQD‐based eSWIR photodetectors, including those containing toxic elements, such as Pb and Hg.
Silver Telluride Colloidal Quantum Dot Solid for Fast Extended Shortwave Infrared Photodetector
Advanced Science
Ahn, Yongnam (Autor:in) / Eom, So Young (Autor:in) / Kim, Gahyeon (Autor:in) / Lee, Jin Hyeok (Autor:in) / Kim, Beomkwan (Autor:in) / Kim, Dongeon (Autor:in) / Si, Min‐Jae (Autor:in) / Yang, Minjung (Autor:in) / Jung, Yujin (Autor:in) / Kim, Bo Seon (Autor:in)
Advanced Science ; 11
01.11.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Silver Telluride Colloidal Quantum Dot Solid for Fast Extended Shortwave Infrared Photodetector
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