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Using ultrafast broad-band transient absorption (TA) spectroscopy ofphoto-excited MAPbBr3 thin films with probe continua in the visible and themid-to-deep-UV ranges, we capture the ultrafast gap renormalization at thefundamental gap situated at the R symmetry point of the Brillouin Zone (BZ) anda higher energy gap at the M point. Global Lifetime analysis, Lifetime densitydistribution and spectral trace fitting analysis are applied to extractquantitative information. Our work confirms the similarity of the energy gaprenormalization at both symmetry points, which rises within the instrumentresponse function (IRF, ~250 fs) and decays in ~400-600 fs times, and an energyred-shift of ~90-150 meV. The ability to monitor different high symmetry pointsin photoexcited perovskites opens exciting prospects into the characterizationof materials, which can be extended to a larger class of materials.

Band Gap Renormalization at Different Symmetry Points in Perovskites