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Nature Materials. doi:10.1038/nmat4392

Authors: E. Orgiu, J. George, J. A. Hutchison, E. Devaux, J. F. Dayen, B. Doudin, F. Stellacci, C. Genet, J. Schachenmayer, C. Genes, G. Pupillo, P. Samorì & T. W. Ebbesen

Nature Materials. doi:10.1038/nmat4390

Authors: Ye Zhu, Ray L. Withers, Laure Bourgeois, Christian Dwyer & Joanne Etheridge

Nature Materials. doi:10.1038/nmat4388

Authors: Martin Kaltenbrunner, Getachew Adam, Eric Daniel Głowacki, Michael Drack, Reinhard Schwödiauer, Lucia Leonat, Dogukan Hazar Apaydin, Heiko Groiss, Markus Clark Scharber, Matthew Schuette White, Niyazi Serdar Sariciftci & Siegfried Bauer

Nature Materials. doi:10.1038/nmat4405

Authors: Michele Sessolo & Henk J. Bolink

Ultrathin, flexible and lightweight perovskite solar cells with improved stability in air can now power model airplanes for several hours.

Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic–organic lead halide perovskite materials appear particularly promising for next-generation solar devices owing to their high power conversion efficiency. The highest efficiencies reported for perovskite solar cells so far have been obtained mainly with methylammonium lead halide materials. Here we combine the promising—owing to its comparatively narrow bandgap—but relatively unstable formamidinium lead iodide (FAPbI3) with methylammonium lead bromide (MAPbBr3) as the light-harvesting unit in a bilayer solar-cell architecture. We investigated phase stability, morphology of the perovskite layer, hysteresis in current–voltage characteristics, and overall performance as a function of chemical composition. Our results show that incorporation of MAPbBr3 into FAPbI3 stabilizes the perovskite phase of FAPbI3 and improves the power conversion efficiency of the solar cell to more than 18 per cent under a standard illumination of 100 milliwatts per square centimetre. These findings further emphasize the versatility and performance potential of inorganic–organic lead halide perovskite materials for photovoltaic applications.

Nature doi: 10.1038/nature14133

Nature Materials. doi:10.1038/nmat4167

Authors: Carl Poelking, Max Tietze, Chris Elschner, Selina Olthof, Dirk Hertel, Björn Baumeier, Frank Würthner, Klaus Meerholz, Karl Leo & Denis Andrienko