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HL: Fachverband Halbleiterphysik
HL 18: Perovskite and Hybrid Photovolatics
HL 18.8: Vortrag
Dienstag, 13. März 2018, 11:30–11:45, EW 203
Light and Temperature Modulated Magneto-Transport in hybrid Lead Halide Perovskites — •Masoumeh Keshavarz1, Steffen Wiedmann2, Haifeng Yuan1, Elke Debroye1, Maarten Roeffaers3, and Johan Hofkens1 — 1Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, 3001 Leuven, Be — 2High Field Magnet Laboratory, Radboud University, 6525 ED Nijmegen, Nl — 3Department of Molecular and Microbial Systems, KU Leuven, 3001 Heverlee, Be
Hybrid lead-halide perovskites exhibit exceptional properties such as high carrier mobility and long diffusion lengths providing a variety of applications as the absorbing layer in solar cells, LEDs and photodetectors. In spite of their rapid evolution in devices, knowledge of the nature and microscopic origin of the intrinsic optical, electrical and structural properties is only just emerging. Using temperature-dependent magneto-transport and Hall measurements on single crystals of MAPbI3 and MAPbBr3 in magnetic fields up to 30 T, we have identified different transport regimes [1]. For temperatures up to 25 K, transport is determined by thermally-activated hopping of charge carriers reflected in a diverging zero-field resistance. Above 25 K, acoustic phonon scattering is the dominant charge transport evident in the temperature dependence of both zero and high-field resistance. Our findings shed new light on the fundamental charge carrier dynamics under steady-state illumination and emphasize the need for a comprehensive theoretical model for perovskite based devices. [1] M Keshavarz, et al., ACS Energy Lett. 2018, 3, 39-45.