Journal
ADVANCED SCIENCE
Volume 7, Issue 19, Pages -Publisher
WILEY
DOI: 10.1002/advs.202001014
Keywords
3D perovskites; 2D perovskites; bilayer perovskite solar cells; passivation; perfluorobenzylammonium iodide; stable 3D; 2D interfaces
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Funding
- European Union's Horizon 2020 research and innovation programme of the PerTPV project [763977]
- Solaronix, Aubonne, Switzerland [CTI 25590.1 PFNM-NM]
- European Social Fund [09.3.3-LMT-K-712-01-0031]
- National Research Council of Science & Technology (NST), Republic of Korea [C030110] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [5199990414547] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Despite organic/inorganic lead halide perovskite solar cells becoming one of the most promising next-generation photovoltaic materials, instability under heat and light soaking remains unsolved. In this work, a highly hydrophobic cation, perfluorobenzylammonium iodide (5FBzAI), is designed and a 2D perovskite with reinforced intermolecular interactions is engineered, providing improved passivation at the interface that reduces charge recombination and enhances cell stability compared with benchmark 2D systems. Motivated by the strong halogen bond interaction, (5FBzAI)(2)PbI(4)used as a capping layer aligns in in-plane crystal orientation, inducing a reproducible increase of approximate to 60 mV in theV(oc), a twofold improvement compared with its analogous monofluorinated phenylethylammonium iodide (PEAI) recently reported. This endows the system with high power conversion efficiency of 21.65% and extended operational stability after 1100 h of continuous illumination, outlining directions for future work.
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