Fig. 7: Interaction between CB-NH2 and perovskite from DFT calculations.

Top views of PbI2-terminated perovskite surface a without and b with CB-NH2. c Side views of the perovskite surface adsorbed with CB-NH2. Notes: the length of N-H···I/N-Pb are depicted. Color scheme: Pb: gray; I: light blue; C: pink; N: dark blue; B: green; H: white.