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Right-click to download an interview with Jan Linnros from KTH Royal Institute of Technology (16 MB MP3)

Abstract

Silicon nanocrystals represent an important class of non-toxic, heavy-metal free quantum dots, where the high natural abundance of silicon is an additional advantage. Successful development in mass-fabrication, starting from porous silicon to recent advances in chemical and plasma synthesis, opens up new possibilities for applications in optoelectronics, bioimaging, photovoltaics, and sensitizing areas. In this review basic physical properties of silicon nanocrystals revealed by photoluminescence spectroscopy, lifetime, intensity trace and electrical measurements on individual nanoparticles are summarized. The fabrication methods developed for accessing single Si nanocrystals are also reviewed. It is concluded that silicon nanocrystals share many of the properties of direct bandgap nanocrystals exhibiting sharp emission lines at low temperatures, on/off blinking, spectral diffusion etc. An analysis of reported results is provided in comparison with theory and with direct bandgap material quantum dots. In addition, the role of passivation and inherent interface/matrix defects is discussed.

Full article at:
Ilya Sychugov, Jan Valenta and Jan Linnros Probing silicon quantum dots by single-dot techniques 2017 Nanotechnology 28 072002

About Jan Linnros

Jan Linnros received his PhD in Physics in 1986 from Chalmers University of Technology (Göteborg, Sweden) where he studied ion beam processing of materials. After a post-doc at Bell Labs, Murray Hill, he joined the Swedish Institute of Microelectronics in Stockholm to work on semiconductor material and device characterization.

His main interest in the optical properties of silicon began in 1993 when he accepted a research position at Royal Institute of Technology and began studying porous silicon and eventually single quantum dots. He was appointed full professor in 2001, is an active teacher and initiated/headed a master program in Nanoelectronics/Nanotechnology.

Linnros has published ~200 scientific papers in international journals and is a cofounder of the company ‘Scint-X’ developing an imaging X-ray detector. His current research interests include: silicon nanostructures such as nanocrystals, nanowires, nanopores and associated nanofabrication methods including electrochemical etching and nanolithography, as well as X-ray imaging techniques. Recent projects include the use of silicon nanostructures in bio-molecule sensing (nanowires) and DNA sequencing (nanopores) and for modifying surface properties. Photoluminescence spectroscopy of individual silicon quantum dots is one of his main scientific break-throughs.