Exciton–exciton scattering in perovskite CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> single crystal

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Abstract

<jats:title>Abstract</jats:title> <jats:p>We have measured photoluminescence spectra in CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>PbBr<jats:sub>3</jats:sub> at low temperatures and found a nonlinear emission at the lower energy side of the exciton resonance. Considering that this signal shows a rapid decay, we have assigned it as originating from the exciton–exciton inelastic scattering process called P-emission. The energy difference between this P-emission and the free exciton resonance is 20–30 meV, which is consistent with recent studies of the exciton binding energy.</jats:p>

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