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Week of August 1, 2010

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"Bulk heterojunction solar cells with internal quantum efficiency approaching 100%," by Sung Heum Park and 9 others, Nature Photonics, 3(5): 297-302, May 2009.

[Authors' affiliations: University of California, Santa Barbara; Gwangju Institute of Science and Technology, South Korea; University of Laval, Quebec City, Quebec, Canada]

Abstract: "We report the fabrication and measurement of solar cells with 6% power conversion efficiency using the alternating co-polymer, poly[N-9 ''-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT) in bulk heterojunction composites with the fullerene derivative [6,6]-phenyl C-70-butyric acid methyl ester (PC70BM). The PCDTBT/PC70BM solar cells exhibit the best performance of any bulk heterojunction system studied to date, with J(SC) = 10.6 mA cm(-2), V-OC = 0.88 V, FF = 0.66 and eta(e) = 6.1% under air mass 1.5 global (AM 1.5 G) irradiation of 100 mW cm(-2). The internal quantum efficiency is close to 100%, implying that essentially every absorbed photon results in a separated pair of charge carriers and that all photogenerated carriers are collected at the electrodes."

This 2009 report from Nature Photonics was cited 75 times in current journal articles indexed by Clarivate Analytics during March-April 2010. Aside from review articles, only one other report published in the last two years and indexed under the heading of "physics" recorded a higher number of citations during that two-month period. Prior to the most recent bimonthly count, citations to the paper have accrued as follows:

January-February 2010: 34 citations
November-December 2009: 36
September-October 2009: 19
July-August 2009: 8
May-June 2009: 1

Total citations to date: 173

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. An updated CD containing the most recent bimonthly data is mailed with every new issue of Science Watch, six times a year. The CD also includes an electronic version of the Science Watch issue in HTML format, for personal desktop access.

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