Analysis of substrate coverage of hybrid halide perovskite thin films deposited on glass

ABSTRACT In this work we have studied coverage characteristics of organo-metal lead halide perovskite thin films deposited through the spin-coating technique onto glass substrates that were subjected to different predeposition treatments. Samples were deposited at room temperature using different spinning speeds and two different solvents, namely, dimethylformamide (DMF) and gamma-butyrolactone (GBL). In this way we obtained samples with different characteristics. Characterization of substrate coverage was performed through optical microscopy and we have also performed optical characterization of the deposited films through transmittance measurements. All obtained samples were highly polycrystalline as evidenced from Xray diffraction measurements.摘要 本研究针对经不同预沉积处理的玻璃基底，采用旋涂工艺制备有机金属卤化铅钙钛矿（organo-metal lead halide perovskite）薄膜，对其覆盖特性展开研究。实验于室温条件下进行，通过调控旋涂转速并选用两种溶剂——二甲基甲酰胺（DMF）与γ-丁内酯（GBL），得到了多组特性各异的样品。研究采用光学显微镜表征基底覆盖情况，并借助透光率测量完成沉积薄膜的光学特性分析；所有制备得到的样品均为高多晶结构，该结论可通过X射线衍射（X-ray diffraction）测量结果得以验证。