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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3025
DTSTART:20130826T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260312T020709Z
LAST-MODIFIED:20130826T183314Z
LOCATION:5280 Chamberlin
SUMMARY:Quantum Effects in Transport Through Semiconductor Nanocrystal
 s and Their Ensembles\, R. G. Herb Condensed Matter Seminar\, Omri Wol
 f\, Racah Institute of Physics\, The Hebrew University of Jerusalem
DESCRIPTION:Semiconductor nanocrystals (NCs) are very promising for us
 e in electronic and opto-electronic applications. This arises from qua
 ntum confinement effects that give an additional parameter for tuning 
 their electrical transport and optical properties. In order to use thi
 s "knob" effectively\, extensive studies must be carried out both on s
 ingle particles and on their ensembles.<br>
\n<br>
\nI will present se
 veral experiments aimed at revealing quantum effects via transport mea
 surements through several types of NCs. First\, I will show that collo
 idal CdSe and CdS nanorods can be used as single electron charge senso
 rs due to induced current switching. Second\, I will demonstrate that 
 surface recombination has a profound\, size-dependent\, effect on the 
 photo-transport through Si-NCs ensembles. Finally\, I will present a s
 ystematic scanning tunneling spectroscopy study of size and surface-ch
 emistry effects on the electronic level structure of Si-NCs.  The tunn
 eling spectra clearly exhibit the quantum confinement effect even in (
 surface-ligand dependent) cases where these are not manifested in the 
 optical spectra. In addition\, the spectra show a p-type surface dopin
 g effect in nitrogen terminated Si-NCs.
URL:https://www.physics.wisc.edu/events/?id=3025
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