Journal
ADVANCED MATERIALS
Volume 33, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101823
Keywords
hydrophobicity; Ruddlesden-Popper perovskites; spacer cations; thermal stability
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Funding
- National Natural Science Foundation of China (NSFC) [51803085, 51833004, 22005131, U20A20128]
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By incorporating hydrophobic 4TFBZA into MAPbI(3), highly efficient and stable quasi-2D hybrid perovskite solar cells have been successfully demonstrated. The structure can effectively passivate trap states, restrain ion motion, suppress perovskite decomposition, and improve both thermal and moisture stability.
Highly efficient and stable quasi-2D hybrid perovskite solar cells (PSCs) using hydrophobic 4-(trifluoromethyl) benzylamine (4TFBZA) as the spacer cation are successfully demonstrated. It is found that the incorporation of hydrophobic 4TFBZA into MAPbI(3) can effectively induce a spontaneous upper gradient 2D (SUG-2D) structure, passivate the trap states, and restrain the ion motion. Meanwhile, the strong hydrogen bonding of F center dot center dot center dot H-N between 4TFBZA ions and methylamine ions can effectively suppress the decomposition of perovskite, which gives the device a better thermal stability. Besides, due to the SUG-2D structure with hydrophobic 4TFBZA, the device also exhibits a better moisture stability. The SUG-2D-structure-based device exhibits a power conversion efficiency of 17.07% with a high open-circuit voltage of 1.10 V and a notable fill factor of 71%. This work provides a new strategy for constructing efficient and stable quasi-2D PSCs, and it is an inspiration for the packaging strategy of perovskites.
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