2026-04-17T03:12:27Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4022892026-01-21T05:56:15Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Peng, Lucheng author Wang, Yongjie author Ren, Yurong author Wang, Zhuoran author Cao, Pengfei author Konstantatos, Gerasimos author 2024-02-02 Colloidal quantum dot (CQD) technology is considered the main contender toward a low-cost high-performance optoelectronic technology platform for applications in the short-wave infrared (SWIR) to enable 3D imaging, LIDAR night vision, etc. in the consumer electronics and automotive markets. In order to unleash the full potential of this technology, there is a need for a material that is environmentally friendly, thus RoHS compliant, and possesses adequate optoelectronic properties to deliver high-performance devices. InSb CQDs hold great potential in view of their RoHS-compliant nature and-in principle-facile access to the SWIR. However, to date progress in realizing high-performance optoelectronic devices, including photodetectors (PDs), has been limited. Here, we have developed a synthesis method for producing size-tunable InSb CQDs with distinct excitonic peaks spanning a wide range from 900 to 1750 nm. To passivate the surface defects and enhance the photoluminescence (PL) efficiency of InSb CQDs, we further designed an InSb/InP core–shell structure. By employing the InSb/InP core–shell CQDs in a photodiode device stack, we report on robust InSb CQD SWIR photodetectors that exhibit an external quantum efficiency (EQE) of 25% at 1240 nm, a wide linear dynamic range exceeding 128 dB, a photoresponse time of 70 ns, and a specific detectivity of 4.4 × 1011 jones. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica Optoelectronic devices Quantum dots Infrared detectors Optical detectors III-V Colloidal quantum dots InSb Photodetectors Short-wave infrared Dispositius optoelectrònics Punts quàntics Detectors de raigs infraroigs Detectors òptics InSb/InP core-shell colloidal quantum dots for sensitive and fast short-wave infrared photodetectors