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Wendy U. Huynh,Janke J. Dittmer,A. Paul Alivisatos*
We demonstrate that semiconductor nanorods can be used to fabricate
readily processed and efficient hybrid solar cells togetherwith
polymers. By controlling nanorod length, we can change thedistance on
which electrons are transported directly through thethin film device.
Tuning the band gap by altering the nanorodradius enabled us to
optimize the overlap between the absorptionspectrum of the cell and
the solar emission spectrum. A photovoltaicdevice consisting of
7-nanometer by 60-nanometer CdSe nanorodsand the conjugated polymer
poly-3(hexylthiophene) was assembledfrom solution with an external
quantum efficiency of over 54%and a monochromatic power conversion
efficiency of 6.9% under0.1 milliwatt per square centimeter
illumination at 515 nanometers.Under Air Mass (A.M.) 1.5 Global solar
conditions, we obtaineda power conversion efficiency of 1.7%.
Department of Chemistry, University of California, Berkeley and
Materials Science Division, Lawrence Berkeley National Laboratory,
Berkeley, CA 94720, USA.
*
To whom correspondence should be addressed. E-mail:
alivis{at}uclink4.berkeley.edu
