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Formamidinium lead bromide (FAPbBr3) perovskite owing to suitable wide band gap has promising application in the fields of semitransparent and tandem solar cells. However, the effect of photoinactive δ phase (δ‐FAPbBr3) on the film and device properties is still unclear and rarely investigated. In this work, the authors find that the growth of δ‐FAPbBr3 has a strong relationship with the property of the underlayer. On the hydrophilic underlayer, crystalline δ‐FAPbBr3 is uniformly distributed in the bulk of the α‐FAPbBr3 film, which has a lower defect density and better carrier transport. A power conversion efficiency of 9.12% is achieved by the management of δ‐FAPbBr3 and using a phosphonate/phosphine oxide dyad additive, which is the highest value among the inverted FAPbBr3‐based perovskite solar cells (PSCs). Moreover, the light utilization efficiency of a semitransparent device reaches 3.15%. This work provides new insights and methods for the realization of high‐performance FAPbBr3‐based PSCs. [ABSTRACT FROM AUTHOR]

An efficient and practical decarboxylative double benzylation method for various 2-picolinic acids has been established by using a bimetallic catalytic system of palladium(II) chloride (PdCl2) and silver(I) oxide (Ag2O), which offered a variety of diarylmethane derivatives with moderate to good yields. [ABSTRACT FROM AUTHOR]

Self-assembled monolayers (SAMs) as the hole-selective contact have achieved remarkable success in iodine-based perovskite solar cells (PSCs), while their impact on bromine-based PSCs is limited due to the poor perovskite crystallization behavior and mismatched energy level alignment. Here, a highly efficient SAM of (2-(3,6-diiodo-9H-carbazol-9-yl)ethyl)phosphonic acid (I-2PACz) is employed to address these challenges in FAPbBr 3 -based PSCs. The incorporation of I atoms into I-2PACz not only releases tensile stress within FAPbBr 3 perovskite, promoting oriented crystallization and minimizing defects through halogen-halogen bond, but also optimizes the energy levels alignment at hole-selective interface for enhanced hole extraction. Ultimately, a power conversion efficiency (PCE) of 11.14% is achieved, which stands among the highest reported value for FAPbBr 3 PSCs. Furthermore, the semitransparent devices/modules exhibit impressive PCEs of 8.19% and 6.23% with average visible transmittance of 41.98% and 38.99%. Remarkably, after operating at maximum power point for 1000 h, the encapsulated device maintains 93% of its initial PCE. These results demonstrate an effective strategy for achieving high-performance bromine-based PSCs toward further applications., (© 2024 Wiley‐VCH GmbH.)