000212465 001__ 212465
000212465 005__ 20181203024020.0
000212465 0247_ $$2doi$$a10.1002/anie.201500014
000212465 022__ $$a1433-7851
000212465 02470 $$2ISI$$a000356886600031
000212465 037__ $$aARTICLE
000212465 245__ $$aThe Significance of Ion Conduction in a Hybrid Organic-Inorganic Lead-Iodide-Based Perovskite Photosensitizer
000212465 260__ $$aWeinheim$$bWiley-Blackwell$$c2015
000212465 269__ $$a2015
000212465 300__ $$a6
000212465 336__ $$aJournal Articles
000212465 520__ $$aThe success of perovskite solar cells has sparked enormous excitement in the photovoltaic community not only because of unexpectedly high efficiencies but also because of the future potential ascribed to such crystalline absorber materials. Far from being exhaustively studied in terms of solid-state properties, these materials surprised by anomalies such as a huge apparent low-frequency dielectric constant and pronounced hysteretic current-voltage behavior. Here we show that methylammonium (but also formamidinium) iodoplumbates are mixed conductors with a large fraction of ion conduction because of iodine ions. In particular, we measure and model the stoichiometric polarization caused by the mixed conduction and demonstrate that the above anomalies can be explained by the build-up of stoichiometric gradients as a consequence of ion blocking interfaces. These findings provide insight into electrical charge transport in the hybrid organic-inorganic lead halide solar cells as well as into new possibilities of improving the photovoltaic performance by controlling the ionic disorder.
000212465 6531_ $$adielectric constant
000212465 6531_ $$ahysteresis
000212465 6531_ $$aionic conduction
000212465 6531_ $$aperovskite solar cells
000212465 6531_ $$apolarization
000212465 700__ $$aYang, Tae-Youl$$uMax Planck Inst Solid State Res, D-70569 Stuttgart, Germany
000212465 700__ $$aGregori, Giuliano$$uMax Planck Inst Solid State Res, D-70569 Stuttgart, Germany
000212465 700__ $$0247078$$aPellet, Norman$$g179666$$uMax Planck Inst Solid State Res, D-70569 Stuttgart, Germany
000212465 700__ $$0240191$$aGraetzel, Michael$$g105292$$uMax Planck Inst Solid State Res, D-70569 Stuttgart, Germany
000212465 700__ $$aMaier, Joachim$$uMax Planck Inst Solid State Res, D-70569 Stuttgart, Germany
000212465 773__ $$j54$$k27$$q7905-7910$$tAngewandte Chemie-International Edition
000212465 909C0 $$0252060$$pLPI$$xU10101
000212465 909CO $$ooai:infoscience.tind.io:212465$$pSB$$particle
000212465 917Z8 $$x105528
000212465 937__ $$aEPFL-ARTICLE-212465
000212465 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000212465 980__ $$aARTICLE