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SUMMARY:Improving Charge Carrier Separation in Semiconductor Nanoparticles
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20180001T000000
UID:2026-04-30-17-44-46@natsci.colostate.edu
DTSTAMP:20260430T174446
Description:Literature Seminar Abstract\n\nIn past years\, the need to deve
 lop technologies to make use of solar energy has led to extensive research
  into the semiconductor materials for such applications. Due to their elec
 tronic structure\, semiconductor materials can be used to drive photocatal
 ysis through the photogeneration of charge carriers that can partake in ox
 idation or reduction reactions. Specifically\, semiconductor nanoparticles
  are attractive materials for such applications as they offer a larger sur
 face area compared to bulk materials. A larger surface area leads to a gre
 ater number of reactive sites for the photocatalytic reaction to occur. Ho
 wever\, the photocatalytic efficiency of these nanoparticles systems is li
 mited by the ability of the charge carriers to separate. To improve the ph
 otocatalytic efficiency\, methods to enhance the charge carrier separation
  need to be developed. The Durrant group has demonstrated two such methods
 . They have shown that for a nanostructured film of TiO2\, charge carrier 
 separation can be improved by changed the applied potential on the system.
  To further investigate the what causes the increase in charge carrier sep
 aration\, transient absorption was used to understand the decay of the cha
 rge carriers. They showed that the carrier lifetime increases with applied
  potential and is likely the source of the improved charge carrier separat
 ion. The second method makes use of sacrificial scavengers to improve char
 ge carrier separation. They showed again that for a nanostructured film of
  TiO2\, the carrier lifetime can be extended through the use of either a h
 ole or electron scavenger. These two strategies can be used to improve the
  photocatalytic efficiency of TiO2 nanoparticles and could be extended to 
 other semiconductor materials as well. 4:00 pm
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