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

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 surface with under-coordinated Pb highly electronegative [BF4]− anions enriched at SnO2 interface. This spontaneous diffusion effect of cation anion improves band alignment two adjacent interfaces reduces recombination losses.