This research demonstrates the fast synthesis of CH₃NH₃PbBr₃ perovskite powder via antisolvent addition and further thin-film synthesis by one-step spin coating. The structural and optical properties are investigated via X-ray diffraction, Fourier-transform infrared spectroscopy, and UV–Vis spectroscopy. Crystallite sizes are compared by three different size estimation techniques, which range between 95.8 nm and 105 nm. The perovskite showed a higher absorption coefficient over 10⁴ cm⁻¹ and a refractive index from 3.4 to 2.3 in the visible spectrum. The bandgap was estimated via three district methods, which revealed a very slightly varied bandgap in the range of 2.29 eV–2.32 eV.

中文翻译：

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不同方法对钙钛矿微晶尺寸和带隙的比较研究

本研究展示了通过添加抗溶剂快速合成 CH ₃ NH ₃ PbBr ₃钙钛矿粉末，并通过一步旋涂进一步合成薄膜。通过 X 射线衍射、傅里叶变换红外光谱和紫外-可见光谱研究结构和光学性质。微晶尺寸通过三种不同的尺寸估计技术进行比较，其范围在 95.8 nm 和 105 nm 之间。^{钙钛矿在可见光谱中显示出超过 10 4}  cm ^-1的更高吸收系数和从 3.4 到 2.3 的折射率。带隙是通过三个区域方法估计的，结果显示带隙在 2.29 eV 到 2.32 eV 范围内变化非常小。