通过氢键调节钙钛矿结晶制备高性能的太阳能电池

Modulation of Perovskite Crystallization Using Hydrogen Bonding for High-Performance Solar Cells

为了调节钙钛矿薄膜的结晶动力学,降低其缺陷浓度,六氟磷酸甲胺(MAPF6)作为添加剂被引入钙钛矿前驱体溶液。傅里叶变换红外(FT-IR)和稳态发光(PL)光谱表明MAPF6和钙钛矿之间存在氢键作用。通过X-射线衍射(XRD)、扫描电镜(SEM)和空间电荷限制电流(SCLC)等表征发现,引入MAPF6之后,钙钛矿薄膜的晶粒尺寸变大,结晶度提高,缺陷浓度降低。最终,加入添加剂的器件效率得到提升,从20.77%(参比器件)提升至22.45%。

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%.