The lead halide perovskite semiconductor CH3NH3PbBr3 exhibits an intriguing difference between one-photon and two-photon excited photoluminescence spectra and dynamics. It is revealed that the dynamical photoluminescence behaviors are dominated by diffusion of photocarriers from the near-surface region to the interior region of the single-crystal sample, due to the high mobilities of photoexcited electrons and holes.
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Yamada et al. (2016) studied this question.
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