Hot Paper in Chemistry

November 2014
“Sequential deposition as a route to high-performance perovskite-sensitized solar cells,” by Julian Burschka and colleagues, Nature, 499(7458): 316, 18 July 2013.

Abstract: “Following pioneering work, solution-processable organic-inorganic hybrid perovskites--such as CH3NH3PbX3 (X = Cl, Br, I)--have attracted attention as light-harvesting materials for mesoscopic solar cells. So far, the perovskite pigment has been deposited in a single step onto mesoporous metal oxide films using a mixture of PbX2 and CH3NH3X in a common solvent. However, the uncontrolled precipitation of the perovskite produces large morphological variations, resulting in a wide spread of photovoltaic performance in the resulting devices, which hampers the prospects for practical applications. Here we describe a sequential deposition method for the formation of the perovskite pigment within the porous metal oxide film. PbI2 is first introduced from solution into a nanoporous titanium dioxide film and subsequently transformed into the perovskite by exposing it to a solution of CH3NH3I. We find that the conversion occurs within the nanoporous host as soon as the two components come into contact, permitting much better control over the perovskite morphology than is possible with the previously employed route. Using this technique for the fabrication of solid-state mesoscopic solar cells greatly increases the reproducibility of their performance and allows us to achieve a power conversion efficiency of approximately 15 per cent (measured under standard AM1.5G test conditions on solar zenith angle, solar light intensity and cell temperature). This two-step method should provide new opportunities for the fabrication of solution-processed photovoltaic cells with unprecedented power conversion efficiencies and high stability equal to or even greater than those of today's best thin-film photovoltaic devices.”

This 2013 report from Nature was cited 97 times in current journal articles indexed by Thomson Reuters during July-August 2014. During that two-month period, no other paper indexed under the main heading of Chemistry, aside from reviews, garnered a higher number of citations. Prior to the most recent bimonthly count, citations to the report have accrued as follows, as tracked by Essential Science Indicators Hot Papers:

May-June 2014: 53 citations
March-April 2014: 66
January-February 2014: 121
November-December 2013: 17
September-October 2013: 10
July-August 2013: 2
January-February 2013: 9

Total citations to date:375

SOURCE: Thomson Reuters Web of Science

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