Fig. 4. HT from perylene diimide chromophores to CsPbBr₃ nanoplatelets upon exciting at 510 nm.

a Transient absorption (TA) spectrum of CsPbBr₃ NPLs + PDI hybrid between 400 and 550 nm, showing the growth (up to 30 ps) and subsequent decay of the exciton bleach of the NPLs. b TA spectrum of CsPbBr₃ NPLs + PDI hybrid between 465 and 900 nm, showing the spectral features of PDI excited state (PDI*) and PDI anion (PDI⁻). c Comparison of the temporal dynamics of the exciton bleach of CsPbBr₃ NPLs + PDI hybrid exciton bleach (453 nm) and the PDI⁻ photoinduced absorption growth (~762 nm). Solid lines represent the experimental data while dotted lines are the result of the target global analysis. d Kinetic model used for the target global analysis for hole transfer (HT) from PDI chromophores to NPLs in CsPbBr₃ NPLs + PDI hybrid. The ratio of attached PDI vs. PDI in solution was fitted to be 4:6 (for details, see Supplementary Note 3).