Here, 2,2′‐ and 3,3′‐bipyridine are introduced for the first time as the core structure to get two new hole transport materials (HTMs), namely F22 and F33. The electron‐withdrawing nature of bipyridine lowers the HOMO level of the new compounds and enhances the open‐circuit voltage of perovskite solar cells. Especially for F33, the better planarity leads to better conjugation in the whole molecule and the molecular interaction is enhanced. Hole‐mobility tests, steady‐state photoluminescence (PL) spectra as well as time‐resolved PL decay results demonstrate that the new HTMs exhibit good hole extraction and hole‐transporting property. Impressive power conversion efficiencies of 17.71 and 18.48 % are achieved in conventional planar perovskite (CH3NH3PbI3−xClx) solar cells containing F22 and F33 as HTMs, respectively. As far as we know, this is the first report on bypiridine‐based HTMs with leading efficiencies, and the design motif in this work opens a new way for devising HTMs in the future.

Incorporating DPP/ISO-based interfacial material to improve the performance of inverted PSCs.

No abstract

Kinetic resolution of racemic spiroindolines with s factors of ≤15200 has been developed to access enantiomerically enriched indoleannulated medium-sized lactams and spiroindolines through Ir-catalyzed asymmetric allylative ring-opening reaction. Density functional theory calculations support the idea that the accurate discrimination of two spiroindoline enantiomers by (η 3 -allyl)-iridium(III) species and the perfect central-to-axial chirality conversion during C−C bond fragmentation ensure the stereoselective formation of two contiguous stereogenic centers and one axis in the mediumsized lactams.