Fig. 1: Passivation mechanism study of PBP in WBG perovskite subcells.
From: Minimized optical/electrical energy loss for 25.1% Monolithic perovskite/organic tandem solar cells
a Molecular structure of PBP. b Photographs of the PBP, PBP + PbI2 and PBP + CsI solutions. c 1H NMR spectra of PBP, PBP + PbI2 and PBP + CsI solutions. d, e High-resolution XPS spectra of (d) Pb 4f and (e) I 3d for the pristine and PBP-treated perovskite films. f, g PL mapping of (f) pristine and (g) PBP-treated perovskite films. h, i Top-surface SEM images of the (h) pristine and (i) PBP-treated perovskite films. j, k AFM images of (j) the pristine and (k) PBP-treated perovskite films.
