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SUMMARY:Photophysics of Strongly Confined Multiexcitons from the Perspecti
 ve of Lasing and Solar Energy Conversion - Dr. Victor I. Klimov\, Los Alam
 os National Laboratory
DTSTART:20100430T100000Z
DTEND:20100430T110000Z
UID:TALK23971@talks.cam.ac.uk
CONTACT:Dr. Z Chen
DESCRIPTION:Using semiconductor nanocrystals one can produce extremely str
 ong spatial confinement of electronic wave functions not accessible with o
 ther types of nanostructures. One consequence of this effect is a signific
 ant enhancement in carrier-carrier interactions that lead to a number of n
 ovel physical phenomena including ultrafast mutiexciton decay due to Auger
  recombination and efficient generation of multiple electron-hole pairs by
  single photons via carrier multiplication. In this talk\, I will discuss 
 the implications of ultrafast Auger decay for lasing applications of nanoc
 rystals and several recent approaches developed in our group for resolving
  this problem by engineering carrier-carrier interactions in various types
  of heterostructured nanocrystals. I will also review the current status o
 f carrier-multiplication research including experimental challenges in stu
 dies of this phenomenon\, the role of extraneous effects\, the competing e
 nergy relaxation channels\, and implications of carrier multiplication in 
 solar photovoltaics. 
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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