fig1

Figure 1. SEM of (A) as-pressed FAPbI₃ wafer, (B) P-FAPbI₃ wafer, and (C) P&C-FAPbI₃ wafer. (D) The schematic diagram from as-pressed FAPbI₃ wafer, to P-FAPbI₃ wafer, and then to P&C-FAPbI₃ wafer. (E) The photo of a planar structured photodetector based on the P&C-FAPbI₃ wafer. (F) I-V curves of the P&C-FAPbI₃ wafer-based photodetectors. (G) XRD patterns spectra of the powder, solution-processed FAPbI₃ film, as-pressed wafer, P-FAPbI₃ wafer, and P&C-FAPbI₃ wafer.