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Week of May 10, 2009 < Back ¦ 2009 ¦ Home

Hot Paper in Physics

"Efficient tandem polymer solar cells fabricated by all-solution processing," by Jin Young Kim, Kwanghee Lee, Nelson E. Coates, Daniel Moses, Thuc-Quyen Nguyen, Mark Dante, and Alan J. Heeger, Science, 317(5835): 222-5, 13 July 2007.

[Authors' affiliations: University of California, Santa Barbara; Gwangju Institute of Science and Technology, Korea.

Abstract: "Tandem solar cells, in which two solar cells with different absorption characteristics are linked to use a wider range of the solar spectrum, were fabricated with each layer processed from solution with the use of bulk heterojunction materials comprising semiconducting polymers and fullerene derivatives. A transparent titanium oxide (TiOx) layer separates and connects the front cell and the back cell. The TiOx layer serves as an electron transport and collecting layer for the first cell and as a stable foundation that enables the fabrication of the second cell to complete the tandem cell architecture. We use an inverted structure with the low band-gap polymer-fullerene composite as the charge-separating layer in the front cell and the high band-gap polymer composite as that in the back cell. Power-conversion efficiencies of more than 6% were achieved at illuminations of 200 milliwatts per square centimeter."

This 2007 report from Science was cited 42 times in current journal articles indexed by Clarivate Analytics during January-February 2009. During that two-month period, only two other papers designated under the main heading of physics and published in the last two years, aside from reviews, garnered higher citation totals. (This cross-disciplinary materials-science paper, it should be noted, would also be suitable for the main Hot Papers "chemistry" category.) Prior to the most recent bimonthly count, citations to the paper have accrued as follows:

November-December 2008: 41 citations
September-October 2008: 32
July-August 2008: 28
May-June 2008: 18
March-April 2008: 21
January-February 2008: 12
November-December 2007: 5

Total citations to date: 199

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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