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.

Defects and energy offsets at the bulk and heterojunction interfaces of perovskite are detrimental to the efficiency and stability of perovskite solar cells (PSCs). Herein, we designed an amphiphilic π-conjugated ionic compound (QAPyBF 4 ), implementing simultaneous defects passivation and interface energy level alignments. The p-type conjugated cations passivated the surface trap states and optimized energy alignment at the perovskite/hole transport layer. The highly electronegative [BF 4 ] À enriched at the SnO 2 interface featured desired band alignment due to the dipole moment of this interlayer. The planar n-i-p PSC had an efficiency of 23.1 % with V oc of 1.2 V. Notably, the synergy effect elevated the intrinsic endothermic decomposition temperature of the perovskite. The modified devices showed excellent long-term thermal (85 °C) and operational stability at the maximum power point for 1000 h at 45 °C under continuous one-sun illumination with no appreciable efficiency loss.

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At this time of perovskite solar cells (PSCs) development, their commercialization is not only attractive but perhaps the only choice to replace the thin film photovoltaics (PV) and conventional silicon...

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