Nanocrystals have reached a mass market with their use as light sources in displays. While this first application relies on wide band gap materials, narrower band gap materials with optical properties in the infrared appear equally promising for the emergence of low cost optoelectronic devices, and because the infrared is mostly out of the reach of organic materials. Potential applications include solar cell and infrared light sensing.
The session will be dedicated to all aspects relative to infrared active colloidal nanocrystals from material synthesis up to the device application. Lead chalcogenides (PbS and PbSe) have been the most investigated narrow band gap nanocrystals and present a high level of maturity for synthesis control and transport properties. Other materials have also raised interests such as mercury chalcogenides to reach longer wavelength, and less toxic compounds such as doped oxide.
The session will also focus on the material properties of these infrared nanocrystals. This include the nature of their optical transitions which can present interband, intraband or plasmonic absorption and their transport properties. Finally, a last aspect of the discussion will be focused on the device integration of these nanocrystals for various applications such as light sensing, gas sensing, smart windows
- Narrow band gap (PbX, HgX...) nanocrystals with infrared absorption and emission : synthesis and surface chemistry.
- oped and degenerately doped semiconductor (oxide, copper chalcogenides, silicon...) with intraband and plasmonic features.
- Carrier dynamics in narrow band gap colloidal materials.
- Transport in narrow band gap material.
- Sensing (light, gas, solar cell...) application using infrared nanocrystal as active material.
- Advances in device design using infrared nanocrystal as active material.
- Infrared light emission from nanocrystal (photoluminescence, lasing...).
Emmanuel is an ESPCI engineer and hold a master degree from universite Pierre and marie Curie in condensed matter physics. He did his PhD under supervision of Emmanuel Rosencher on the transport properties of superlattices used as infrared detector. He then did post doc in the group of Guyot Sionnest and Dubertret, working on the optoelectronic properties of nanocrystals. Since 2015 he is a CNRS researcher at Insitute for Nanoscience at Sorbonne Université. His team is dedicated to optoelectronic of confined nanomaterials
Andrey L. Rogach is a Chair Professor of Photonics Materials at the Department of Physics and Materials Science, and the Founding Director of the Centre for Functional Photonics at City University of Hong Kong. He received his Ph.D. in chemistry (1995) from the Belarusian State University in Minsk, and worked as a staff scientist at the University of Hamburg (Germany) from 1995 to 2002. From 2002–2009 he was a lead staff scientist at the Ludwig-Maximilians-Universität in Munich (Germany), where he completed his habilitation in experimental physics. His research focuses on synthesis, assembly and optical spectroscopy of colloidal semiconductor and metal nanocrystals and their hybrid structures, and their use for energy transfer, light harvesting and light emission. His name is on the list of Top 100 Materials Scientists and on the list of Top 20 Authors publishing on nanocrystals in the past decade by Thomson Reuters, ISI Essential Science Indicators. Andrey Rogach is an Associate Editor of ACS Nano, and holds honorary appointments at Trinity College Dublin (Ireland), Xi’An Jiaotong University, Jilin University and Peking University (China).
Philippe Guyot-Sionnest is a professor of Physics and Chemistry at the University of Chicago since 1991. His group developed original aspects of colloidal quantum dots and nanoparticles, including single dot PL microscopy, the luminescent core/shell CdSe/ZnS, intraband spectroscopy, charge transfer doping, electrochemical and conductivity studies, the "solid state ligand exchange", and mid-infrared quantum dots. Other significant works are the development of surface infrared-visible sum-frequency generation, and interfacial time resolved vibrational spectroscopy of adsorbates.
Prof. Z. Hens received his PhD in applied physics from Ghent University in 2000, worked as a postdoctoral fellow at Utrecht University and was appointed professor at the Ghent University department of inorganic and physical chemistry in 2002. His research concerns the synthesis, processing and characterization of colloidal nanocrystals.
Kwang Seob Jeong is a professor in the Department of Chemistry at Korea University. He received his B.S. in Chemistry from Korea University and earned his Ph.D. in Chemistry from The Pennsylvania State University in 2013. Following his doctoral studies, he conducted postdoctoral research as a JFI Fellow at the University of Chicago. He joined the Department of Chemistry at Korea University in 2015. Kwang Seob Jeong was recognized by the Royal Society of Chemistry as a Chemical Communications Emerging Investigator in 2018 and a Pioneering Investigator in 2024. In 2019, he was selected as a POSCO Science Fellow, and in 2021, he received the Korean Chemical Society(KCS)–Wiley Young Chemist Award. His research centers on the discovery and mechanistic understanding of novel electronic transitions in low-dimensional semiconductor nanomaterials, with particular emphasis on narrow-bandgap chalcogenides, infrared optoelectronic devices, and emerging quantum materials.
Steve KershawEthan KlemVanessa Wood is a professor in the Department of Information Technology and Electrical Engineering at ETH Zurich, where she heads the Laboratory for Nanoelectronics. Before joining ETH in 2011, she was a postdoctoral associate in the laboratory of Professor Yet-Ming Chiang and Professor Craig Carter in the Department of Materials Science and Engineering at MIT, performing research on novel lithium-ion battery systems. She received her MSc and PhD from the Department of Electrical Engineering and Computer Science at MIT. Her graduate work was done in the group of Professor Vladimir Bulović and focused on the development of optoelectronic devices containing colloidally synthesized quantum dots.