Sci-Bytes> Hot Paper in Physics
Week of June 5, 2011
"Polymer solar cells with enhanced open-circuit voltage and efficiency," by Hsiang-Yu Chen and 8 others, Nature Photonics, 3(11): 649-53, November 2009.
[Authors' affiliations: Solarmer Energy, Inc., El Monte, CA; University of California, Los Angeles; University of Chicago, IL]
Abstract: "Following the development of the bulk heterojunction structure, recent years have seen a dramatic improvement in the efficiency of polymer solar cells. Maximizing the open-circuit voltage in a low-bandgap polymer is one of the critical factors towards enabling high-efficiency solar cells. Study of the relation between open-circuit voltage and the energy levels of the donor/acceptor in bulk heterojunction polymer solar cells has stimulated interest in modifying the open-circuit voltage by tuning the energy levels of polymers. Here, we show that the open-circuit voltage of polymer solar cells constructed based on the structure of a low-bandgap polymer, PBDTTT4, can be tuned, step by step, using different functional groups, to achieve values as high as 0.76 V. This increased open-circuit voltage combined with a high short-circuit current density results in a polymer solar cell with a power conversion efficiency as high as 6.77%, as certified by the National Renewable Energy Laboratory."
This 2009 report from Nature Photonics was cited 33 times in current journal articles indexed by Clarivate during January-February 2011. During that two-month period, only two other physics papers published in the last two years, aside from reviews, garnered higher citation totals. Prior to the most recent bimonthly count, citations to the paper have accrued as follows:
November-December 2010: 36 citations
September-October 2010: 45
July-August 2010: 30
May-June 2010: 27
March-April 2010: 23
January-February 2010: 3
Total citations to date: 197
SOURCE: Hot Papers Database (Included with a subscription to the print newsletter Science Watch®, available from the Research Services Group of Thomson Reuters. Packaged on a CD that is mailed with each Science Watch issue, the Hot Papers Database contains data on hundreds of highly cited papers published during the last two years. User interface permits searching by author, organization, journal, field, and more. Total citations, as well as citations accrued during successive bimonthly periods, can be assessed and graphed.
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