Fig. 4: Comparison between experimental and theoretical absorption spectra. | Nature Communications

Fig. 4: Comparison between experimental and theoretical absorption spectra.

From: Mahan excitons in room-temperature methylammonium lead bromide perovskites

Fig. 4

a Experimental absorption spectrum of CH3NH3PbBr3 single crystals for the excitation densities of 5, 7.5 and 10 × 1018 cm−3 at 1 ps. Similar trends can be observed at any time delay between 500 fs and several ps. b Theoretical absorption spectra of CH3NH3PbBr3 in the presence of increasing carrier densities, as calculated with the SBE. The black arrow indicates the excitonic enhancement of the above-gap absorption associated with the presence of e–h correlations in the highly photoexcited material. In both cases, the Wannier bound exciton peak persists above nM.

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