Extremely Slow Photoconductivity Response of CH3NH3PbI3 Perovskite
A. Zaban a, S. Tirosh a, L. Gouda a, E. Haltzi a, R. Gottesman a, E. Moscon a b, F. De Angelis b
a Center for Nanotechnology & Advanced Materials, Department of Chemistry, Bar Ilan University, Ramat-Gan, Ramat-Gan, 52900, Israel
b 2Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, I-06123, Perugia, Italy
Invited Speaker, A. Zaban, presentation 074
Publication date: 1st July 2014

Advanced characterization of perovskite solar cells is already in progress yielding highly significant data. However, studies of isolated perovskite thin films under the working conditions of solar cells are still scarce. Presented here are photoconductivity measurements of CH3NH3PbI3 deposited between two dielectric-protected Au electrodes spaced ~2000 nm apart. The photo response of the CH3NH3PbI3 which is subjected to a dc bias, involves two time constants one of which is extremely long, lasting for several seconds. Similar time scale is observed upon transformation back to dark. Our findings seem to clarify the origin of the well-known hysteresis in perovskite solar cells.



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