Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 44, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202204642
Keywords
delta-FAPbI(3); defect passivation; device stability; perovskite solar cells; yellow phase
Categories
Funding
- National Natural Science Foundation of China [51973223]
- China Post-doctoral Science Foundation [2019TQ0318, 2021M693119]
- Opening Project of Shandong Eco Chemical Engineering Collaborative Innovation Center [STHGYX2223]
- [DICP I202011]
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This study reports the use of delta-FAPbI(3) to construct a yellow/black heterophase bilayer, which enhances the efficiency and stability of perovskite solar cells (PSCs). The delta-FAPbI(3) layer can effectively suppress charge recombination at the interface compared to the black-phase perovskite.
Yellow-phase formamidinium lead iodide ( delta-FAPbI(3)) as a degradation product of black perovskite phase is usually unwelcome in perovskite solar cells (PSCs). However, it also shows high potential in passivating defects and protecting perovskite films from moisture intrusion due to its water-stable nature. Herein, the utilization of delta-FAPbI(3) to construct a yellow/black heterophase bilayer is reported, in which the perovskite layer is shielded by in situ formed delta-FAPbI(3) species on the surface, for PSCs with enhanced efficiency and stability. It is found that the delta-FAPbI(3) layer with a broader bandgap than the black-phase perovskite can efficiently suppress the charge recombination at the interface, offering a high PSC efficiency of 23.10%. More importantly, the delta-FAPbI(3) modified devices exhibit preferable stability against various external stresses to that of the control ones. Compared to those using the disliked delta-FAPbI(3) in the literature, the strategy, which maximizes its merits in reducing the interfacial charge recombination and stabilizing the perovskite structure, is more simple yet effective to realize highly efficient and stable PSCs.
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