Figure 3.

(a) Pseudo-colour transient absorption plot of clean graphene/MAPbI₃ interface at different probe wavelength and with pump wavelength of 820 nm. (b) Differential reflection measured from the clean graphene MAPbI₃ heterostructure with 680 nm probe pulse. (c) Normalized differential reflection measured from both dirty- and clean-graphene/MAPbI₃ interface. The dashed line is the laser cross-correlation function used for the deconvolution of the rising part of the transient absorption signal. (d) Normalized time resolved photoluminescence spectroscopy measurements performed on pristine MAPbI₃ and on clean and dirty graphene/MAPbI₃ interfaces. (e) Differential reflection measured from the pristine MAPbI₃, the pristine graphene and the clean graphene/MAPbI₃ interface. (f) Comparison of the theoretical time-dependent density function calculations and experimental results of charge collection time of the carriers. Data taken from ref. [65]. Copyright American Chemical Society@2018.