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Multifunctional fluorinated ammonium salt for high-performance all-inorganic CsPbI2Br perovskite solar cells with efficiency of 16.29%.
- Source :
-
Journal of Alloys & Compounds . Jan2022, Vol. 891, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- • The fluorine atom has induced electrostatic potential and dipole moment change. • Cl- doping can enhance crystallization and prevent phase change. • The champion device achieves a PCE of 16.29% and the humidity stability is improved. [Display omitted] All-inorganic CsPbI 2 Br material has attracted considerable attention due to its good balance between phase stability and absorption capacity. However, the power conversion efficiency (PCE) and device stability of CsPbI 2 Br-based perovskite solar cells (PSCs) still lag far behind those of their counterparts, mainly deriving from the notoriously poor moisture stability under humid environment and large serious charge recombination. Herein, a typical phenethylammonium chlorine (PEACl) and its fluorinated derivative 4-fluoro-phenethylammonium chlorine (F-PEACl) are individually incorporated to modify the surface of CsPbI 2 Br film to ameliorate the above issues. Benefiting from the comprehensive passivation effect of ammonium halogen, the trap states of treated CsPbI 2 Br are vastly suppressed. In particular, fluorination significantly increased the dipole moment and hydrophobic property of F-PEACl. Thus, the present CsPbI 2 Br PSC achieves a champion PCE of 16.29% with high open-circuit voltage of 1.272 V, while the reference device and PEACl-treated device yield PCEs of 14.30% and 15.64%, respectively. More importantly, the PSC with F-PEACl capping layer retains 87.2% of its initial PCE after 1000 h storage under 20% RH ambient without encapsulation. Our results reveal the underlying mechanism of performance improvement by surface passivation strategy and provide an effective approach to further boost the CsPbI 2 Br PSC efficiency and stability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 891
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 153371732
- Full Text :
- https://doi.org/10.1016/j.jallcom.2021.161971