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UID:69dafbcf26332
DTSTAMP:20260411T215631
DTSTART:20171218T113000
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DTEND:20171218T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/779613-beyond-ideal-d
 efects-and-disorder-in-semiconductor-nanocrystals
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Beyond Ideal: Defects and Disorder in Semiconductor Nanocrystals
DESCRIPTION:Rémi Beaulac\, Deparment of Chemistry\, Michigan State Univers
 ity\, 220 Trowbridge Rd\, East Lansing\, MI 48824\, USA
\nColloidal semico
 nductor nanocrystals (NCs) share the fascinating electronic\, optical\, an
 d chemical properties that characterize all semiconductor materials. Like 
 their bulk counterparts\, the electronic structure of NCs is highly deloca
 lized in space\, but without the translational periodicity associated with
  (pseudo)-infinite lattices\, leading to electronic excitations that are h
 ighly sensitive on the overall size and shape of the semiconductor nanocry
 stals\, an effect designated under the term “quantum confinement”. As 
 a consequence\, NCs are particularly well-suited for a host of application
 s – optical sensing and imaging\, light-emission\, photovoltaics\, or ph
 oto-redox transformations – that rely on the extraction of work\, of one
  form or another\, from electronically-excited NCs. Such energy-conversion
  schemes necessarily require control over the energetic configuration of N
 C electronic structure as well as the ability to limit undesired excited-s
 tate relaxation pathways that lead to direct energetic losses by rapid exc
 itonic recombination. Unfortunately\, the photophysical behavior of NCs is
  often complex\, associated with multi-exponential excited-state dynamics\
 , optically-dark trap states\, and luminescence intermittency\, to name bu
 t a few of the phenomena that impede the development of NC-based applicati
 ons. This presentation will highlight recent efforts by our group to chara
 cterize and manipulate the microscopic nature of specific defects that dir
 ectly govern optical properties such as plasmonic resonances and non-radia
 tive recombination\, demonstrating that not all defects are created equal\
 , and that defective NCs can often be associated with desirable characteri
 stics that cannot be obtained from perfect nanostructures.
\nSite web du g
 roupe du Pr Beaulac
\n 
\nCette conférence est présentée par le RQMP 
 Versant Nord du Département de physique de l'Université de Montréal et 
 le Département de génie physique de Polytechnique Montréal.
\n 
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