Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Hybrid and Perovskite Photovoltaics I

CPP 2.10: Vortrag

Montag, 1. April 2019, 12:15–12:30, H18

Charge Carrier Transport in Organo-Metal Halide Perovskites Probed by Transient Microwave Conductivity — •Andreas Baumann¹, Manuel Ullrich², Nathania Henning², Patrick Dörflinger², Vladimir Dyakonov², and Andreas Sperlich² — ¹Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg — ²Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg

The charge carrier mobility is one of the important intrinsic parameters for the performance of solar cell devices as it together with the charge carrier lifetime defines the diffusion length of the charge carriers and hence sets a limit to the device active layer thickness. For lead halide perovskite (HaP) solar cells, long charge carrier diffusion lengths up to micrometer scale have been reported which is primarily due to the long charge carrier lifetime. However, the charge carrier mobility is found to be smaller compared to the theoretically predicted values. In order to investigate the fundamental charge carrier transport properties in HaP materials we used the contact-less technique of transient microwave conductivity (TRMC). We analysed different HaPs including methylammonium lead iodide (MAPbI₃), lead bromide (MAPbBr₃) and mixed cation and halide perovskite by TRMC at room temperature and find the highest charge carrier mobility for MAPbI₃. Finally, TRMC mobilities in MAPbI₃ tested in a wide temperature range show a clear negative temperature coefficient in the tetragonal phase as well as a mobility drop at the phase transition.