Light- and Temperature-Modulated Magneto-Transport in Organic–Inorganic Lead Halide Perovskites

The optoelectronic properties and charge carrier dynamics in hybrid organic–inorganic perovskites under steady-state illumination are the key elements for understanding their high efficiency. We present temperature-dependent Hall and photoconductivity measurements down to a temperature of 4.2 K on single crystals of MAPbI3 and MAPbBr3 in magnetic fields up to 30 T and observed different transport regimes. For temperatures down to 25 K, charge transport is dominated by acoustic phonon scattering as inferred from the temperature dependence of both zero and high-field resistance. Below 25 K, transport is determined by thermally activated hopping of charge carriers reflected in a diverging zero-field resistance and a strong decrease in the carrier’s mobility and concentration. Our findings demonstrate the importance of performing experiments at low temperature to unravel the fundamental charge carrier dynamics and stimulate the need for a comprehensive theoretical model for perovskite-based devices.