Fig. 1: The interaction between perovskite and metal chelates.
From: Tensile strain regulation via grain boundary buffering for flexible perovskite solar cells
a Chemical structures and ESP maps (units: kcal mol−1) of metal chelates. b Pb 4f XPS spectra of PbI2 films modified by different metal chelates. c Pb 4f XPS spectra of perovskite films modified by different metal chelates. d ATR-IR spectra of perovskite film without or with different metal chelates. e The optimized adsorption structures of the binding interaction between Al(acac)3, Al(acB)3, Al(NB)3 and Pb–I-terminated surface.
