Fig. 4: Spatial dynamics of photogenerated holes in α-Fe2O3.
a Steady-state absorption spectrum of the α-Fe2O3 film. The spectrum was fitted (black dash line) to the sum of seven Gaussian bands. The absorption bands assigned to LMCT transitions are shown in green, and those assigned to MMT are shown in blue. The vertical dashed lines indicate the pump photon energies used in the ultrafast optical nanoscopy measurements. b MSD evolution of carrier population distribution for α-Fe2O3 at near-bandgap (2.13 eV) and above-bandgap (2.53 eV, 3.02 eV) excitations with delay time. Error bars represent 2D Gaussian fitting errors. c The relationship between hole diffusion length and delay time of α-Fe2O3 at 3.02 eV pump photon energy. d Schematic diagram of carrier transport in TMOs.
