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%.
关键词
缺陷钝化/氢键/钙钛矿太阳能电池/离子液体
Key words
defects passivation/hydrogen bonding/perovskite solar cells/ionic liquid
维普
万方数据