Abstract Employed the different chain length CnH2n+1NH3Br (n > 1) additives as the surface ligand, we have studied the morphology and optical properties of CH3NH3PbBr3 perovskite thin films systematically. As the alkyl chain-length of incorporated CnH2n+1NH3Br compound into the precursor solution increases, the sizes of CH3NH3PbBr3 crystal decrease, leading that the morphology of the corresponding films get better and the peak positions of photoluminescence (PL) spectra shift-blue. And the best CH3NH3PbBr3 perovskite thin films can be obtained with the C4H9NH3Br addition in the precursor solution, which is attributed to the excellent properties of (C4H9NH3)2PbBr4 material.

中文翻译：

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不同烷基链长CnH2n+1NH3Br添加量对CH3NH3PbBr3钙钛矿薄膜性能的影响

摘要 采用不同链长的CnH2n+1NH3Br (n > 1)添加剂作为表面配体，系统地研究了CH3NH3PbBr3钙钛矿薄膜的形貌和光学性质。随着前驱体溶液中掺入的 CnH2n+1NH3Br 化合物的烷基链长度增加，CH3NH3PbBr3 晶体的尺寸减小，导致相应薄膜的形貌变得更好，光致发光（PL）光谱的峰值位置移蓝。在前驱体溶液中加入 C4H9NH3Br 可以获得最好的 CH3NH3PbBr3 钙钛矿薄膜，这归功于 (C4H9NH3)2PbBr4 材料的优异性能。