Back Cover: Synergy Effect of a π‐Conjugated Ionic Compound: Dual Interfacial Energy Level Regulation and Passivation to Promote Voc and Stability of Planar Perovskite Solar Cells (Angew. Chem. Int. Ed. 11/2022)

Abstract

Perovskites The π-conjugated ionic compound QAPyBF4 was used as a perovskite modulator in the Research Article by Juin-Jei Liou, Taiho Park, Zong-Xiang Xu, and co-workers (e202117303). Experimental investigations showed that p-type conjugated cations [QAPy]2+ adsorb on the perovskite surface with under-coordinated Pb cations and highly electronegative [BF4]− anions enriched at the SnO2 interface. This spontaneous diffusion effect of cation and anion improves the band alignment at two adjacent perovskite interfaces and reduces recombination losses.