Hot Paper in Chemistry

April 2014
“Porphyrin-sensitized solar cells with cobalt (II/III)-based redox electrolyte exceed 12 percent efficiency,” by Aswani Yella, et al., Science, 334(6056): 629-34, 4 November 2011. [Authors' affiliations: Natl. Chiao Tung U., Hsinchu, Taiwan; Ecole Polyt

Abstract: “The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized donor-pi-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8). The specific molecular design of YD2-o-C8 greatly retards the rate of interfacial back electron transfer from the conduction band of the nanocrystalline titanium dioxide film to the oxidized cobalt mediator, which enables attainment of strikingly high photovoltages approaching 1 volt. Because the YD2-o-C8 porphyrin harvests sunlight across the visible spectrum, large photocurrents are generated. Cosensitization of YD2-o-C8 with another organic dye further enhances the performance of the device, leading to a measured power conversion efficiency of 12.3% under simulated air mass 1.5 global sunlight.”


This 2011 report from Science was cited 47 times in current journal articles indexed by Thomson Reuters during September-October 2013. No other chemistry paper indexed during the previous two years, aside from reviews, garnered a higher number of citations during that two-month period. Prior to the most recent bimonthly count, citations to the report have accrued as follows, as tracked by Essential Science Indicators Hot Papers:

July-August 2013: 96 citations
May-June 2013: 102
March-April 2013: 94
January-February 2013: 292
November-December 2012: 105
September-October 2012: 62
July-August 2012: 49
May-June 2012: 42
March-April 2012: 29
January-February 2012: 156
November-December 2011: 3

Total citations to date: 1,077



SOURCE: Thomson Reuters Web of Science

The data and citation records included in this report are from Thomson Reuters Web of ScienceTM. Web of ScienceTM is a registered trademark of Thomson Reuters. All rights reserved.