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The highest demonstrated efficiency is 3.2%, based upon a PCPDTBT polymer donor and CdSe nanoparticle acceptor. The device exhibited a short circuit current of 10.1 mA·cm<sup>−2</sup>, an open circuit voltage of .68 V, and a fill factor of .51.<ref>{{cite journal|last=Dayal|first=Smita|author2=Nikos Kopidakis , Dana C. Olson , David S. Ginley and Garry Rumbles|title=Photovoltaic Devices with a Low Band Gap Polymer and CdSe Nanostructures Exceeding 3% Efficiency|journal=Nano Letters|year=2010|volume=10|issue=1|pages=239–242|doi=10.1021/nl903406s|pmid=20000623|bibcode = 2010NanoL..10..239D |last3=Olson|first3=Dana C.|last4=Ginley|first4=David S.|last5=Rumbles|first5=Garry}}</ref>
In 2011, it was
====Challenges====
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