Abstract In this study, methyl ammonium lead Iodide perovskite (CH3NH3PbI3≡MAPbI3) was deposited as a thin planar film on a glass substrate at room temperature using one-step and two-step methods. The effect of each method of preparation on the structural, morphological, and optical properties was investigated. The results show that the average size of the MAPbI3 crystallites are ~57.3 nm and 25.8 nm for the one and two-step methods, respectively. The pore-filling of the perovskite film is incomplete when using the one-step process but completely filled when two-step method was used. Therefore, both one-step and two-step methods lead to perovskite islands and void-free perovskite layers, respectively. Scanning emission microscopy images show that the quality of the film produced by two-step is much better than that formed via one-step. Moreover, the perovskite film prepared via one-step method tends to produce a higher pinhole density than two-step, and thus lower coverage that leads to a low absorption and a low absorption coefficient. Parameters such as optical absorption coefficient, refractive index, extinction coefficient, dielectric constant, and optical conductivity were also estimated. The intensities of both photoluminescence and amplified spontaneous emission spectra of MAPbI3 sample prepared via one-step method were found to be lower than those prepared via two-step.

中文翻译：

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沉积方法对CH3NH3PbI3钙钛矿薄膜结构和光学性能的影响

摘要 在这项研究中，甲基铵碘化铅钙钛矿 (CH3NH3PbI3≡MAPbI3) 在室温下使用一步法和两步法在玻璃基板上沉积为平面薄膜。研究了每种制备方法对结构、形态和光学性质的影响。结果表明，对于一步法和两步法，MAPbI3 微晶的平均尺寸分​​别为~57.3 nm 和25.8 nm。使用一步法时钙钛矿薄膜的孔隙填充不完全，而使用两步法时则完全填充。因此，一步法和两步法都分别导致钙钛矿岛和无空隙钙钛矿层。扫描发射显微图像显示，两步法生产的薄膜质量比一步法好得多。而且，通过一步法制备的钙钛矿薄膜比两步法制备的钙钛矿薄膜往往产生更高的针孔密度，因此覆盖率较低，从而导致低吸收和低吸收系数。还估计了诸如光吸收系数、折射率、消光系数、介电常数和光导率等参数。发现通过一步法制备的 MAPbI3 样品的光致发光强度和放大自发发射光谱强度均低于通过两步法制备的样品。还估计了光导率。发现通过一步法制备的 MAPbI3 样品的光致发光强度和放大自发发射光谱强度均低于通过两步法制备的样品。还估计了光导率。发现通过一步法制备的 MAPbI3 样品的光致发光强度和放大自发发射光谱强度均低于通过两步法制备的样品。