Journal
ADVANCED MATERIALS
Volume 30, Issue 40, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801948
Keywords
interface engineering; ion exchange; passivating layers; perovskite solar cells; PF6
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) of Korea [NRF-2012M3A6A7054861, NRF-2015M1A2A2053004]
- [NRF-2016M3D1A1027663]
- [NRF-2016M3D1A1027664]
Ask authors/readers for more resources
Interface engineering to form an interlayer via ion exchange reaction is reported. A FA(0.88)Cs(0.12)PbI(3) formamidinium (FA) perovskite layer is first prepared, then FAPF(6) solution with different concentrations is spin-coated on top of the perovskite film, which leads to a partial substitution of iodide by PF6- ion. The second phase with nominal composition of FA(0.88)Cs(0.12)PbI(3-x)(PF6)(x) is grown at the grain boundary, which has island morphology and its size depends on the FAPF(6) solution concentration. The lattice is expanded and bandgap is reduced due to inclusion of larger PF6- ions. The power conversion efficiency (PCE) is significantly enhanced from 17.8% to 19.3% as a consequence of improved fill factor and open-circuit voltage (V-oc). In addition, current-voltage hysteresis is reduced. Post-treatment with FAPF(6) reduces defect density and enhances carrier lifetime, which is responsible for the improved photovoltaic performance and reduced hysteresis. The unencapsulated device with post-treated perovskite film demonstrates better stability than the pristine perovskite, where the initial PCE retains over 80% after 528 h exposure under relative humidity of around 50-70% in the dark and 92% after 360 h under one sun illumination.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available