Journal
NANO ENERGY
Volume 68, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104320
Keywords
Ionic defects; Dual-passivation; Highly crystalline perovskite; Perovskite solar cells
Categories
Funding
- National Key Research and Development Program of China [2018YFA0703503, 2016YFA0202701]
- Overseas Expertise Introduction Projects for Discipline Innovation (111 project) [B14003]
- National Natural Science Foundation of China [51527802, 51702014, 51902021]
- Postdoctoral Research Foundation of China [2019M650488]
- State Key Laboratory for Advanced Metals and Materials [2018Z-03, 2019Z-04]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-042A1, FRF-AS-17-002, FRF-TP-19-005A2]
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The ionic defects in hybrid halide perovskite materials served as the recombination center severely restricts its application for solar cells. Here, we proposed a dual-passivation strategy via simply incorporating low-cost ammonium chloride to simultaneously passivate negative- and positive-charged ionic defects, as indicated by first-principles density functional theory calculation. The efficient defect modulation reduces the defect density and prolongs the carrier lifetime, thereby contributing to the highly crystalline perovskite, which is demonstrated by light-dependent kelvin probe force microscopy, transient absorption and visualized fluorescence lifetime imaging microscopy. Benefiting from these merits, the power conversion efficiency of perovskite solar cells is boosted up to 21.38%. More importantly, this dual-passivation approach can be further extended to mixed-cation perovskite systems, not limited in traditional methylammonium based perovskite only. Such methodology of simultaneously regulating ionic defects in different types may probably give impetus to effectively promote perovskite evolution.
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