Understanding
the charge transport characteristics and their limiting factors in
organolead halide perovskites is of great importance for the development
of competitive and economically advantageous photovoltaic systems
derived from these materials. In the present work, we examine the
charge carrier mobilities in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPI) thin films obtained from a one-step synthesis procedure and
in planar n–i–p devices based on these films. By performing
time-of-flight measurements, we find mobilities around 6 cm<sup>2</sup>/V s for electrons and holes in MAPI thin films, whereas in working
solar cells, the respective effective mobility values are reduced
by 3 orders of magnitude. From complementary experiments on devices
with varying thicknesses of electron and hole transport layers, we
identify the charge extraction layers and the associated interfaces
rather than the perovskite material itself as the major limiting factors
of the charge carrier transport time in working devices