Modulation of Perovskite Crystallization Using Hydrogen Bonding for High-Performance Solar Cells
In order to modulate the crystallization kinetics of perovskite film and reduce its defect density,methylamine hexafluorophosphorate(MAPF6)as an additive was introduced into the perovskite precursor solution.Fourier transform infrared(FT-IR)and steady-state luminescence(PL)spectra showed that there was hydrogen bonding between MAPF6 and perovskite.By conducting X-ray diffraction(XRD),scanning electron microscopy(SEM)and space charge limited current(SCLC)characterizations,we found that the introduction of MAPF6 increased the grain size and crystallinity,and reduced defect density of perovskite film.As a result,the efficiency of MAPF6-treated device was greatly improved from 20.77%(reference device)to 22.45%.
defects passivationhydrogen bondingperovskite solar cellsionic liquid
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