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The intrinsic d.c. electrical resistivity ($\rho$) - measurable on singlecrystals only - is often the quantity first revealing the properties of a givenmaterial. In the case of CH$_3$NH$_3$PbI$_3$ perovskite measuring $\rho$ underwhite light illumination provides insight into the coexistence of extended andshallow localized states (0.1 eV below the conduction band). The former onesdominate the electrical conduction while the latter, coming from neutraldefects, serve as a long-lifetime charge carrier reservoir accessible forcharge transport by thermal excitation. Remarkably, in the best crystals theelectrical resistivity shows a metallic behaviour under illumination up to roomtemperature, giving a new dimension to the material in basic physical studies.

Metallicity and conductivity crossover in white light illuminated CH$_3$NH$_3$PbI$_3$ perovskite