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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2044
DTSTART:20110428T150000Z
DURATION:PT1H0M0S
DTSTAMP:20240329T061559Z
LAST-MODIFIED:20110419T140757Z
LOCATION:5310 Chamberlin
SUMMARY:Improved Charge Collection in Nanostructured Organic Semicondu
ctor Solar Cells\, R. G. Herb Condensed Matter Seminar\, Charles Black
\, Brookhaven National Lab
DESCRIPTION:High-performance organic semiconductor solar cell active l
ayers form via a self-assembly process of phase separation of blended
donor and acceptor materials. Achieving optimal device performance re
quires a delicate balance of trapping the blended material in a non-eq
uilibrium configuration. I will describe our experimental efforts to
confine both organic semiconductors and semiconductor blends within na
nometer-scale volumes to better control material phase separation and
understand the effect of geometry on the material structure\, its elec
tronic properties\, and its photovoltaic performance.
\n
\nA
s one example\, confining blended poly(3-hexylthiophene): [6\,6]-pheny
l-C61-butyric acid methyl ester organic solar cell active layers withi
n nanometer-scale cylindrical volumes more than doubles the supported
photocurrent density compared to equivalent unconfined volumes of the
same blend\, and increases the poly(3-hexylthiophene) hole mobility in
the blend by more than 500 times. Grazing incidence x-ray diffraction
measurements show that the confining volume disrupts polymer ordering
by reducing crystallinity and grain size\, as well as changing crysta
l orientation.
URL:https://www.physics.wisc.edu/events/?id=2044
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