Fig. 4: Schematic of the photophysical processes metal halide perovskites. | npj Computational Materials

Fig. 4: Schematic of the photophysical processes metal halide perovskites.

From: Sub-bandgap charge harvesting and energy up-conversion in metal halide perovskites: ab initio quantum dynamics

Fig. 4

a Pristine system. b System with dynamic defects. Photoexcitation of the pristine system above the bandgap (1) results in intraband relaxation of hot carriers (2), followed by carrier recombination (3). In a system with dynamic defects, sub-bandgap excitation (4) extends light absorption to longer wavelengths, Fig. 2e–h, and allows charges to escape into bands (5). This energy up-conversion process competes with defect assisted charge recombination (6).

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