Improving the Photoluminescence Properties of Perovskite CH3NH3PbBr3-xClx Films by Modulating Organic Cation and Chlorine Concentrations

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• 作者：Jun Yan ; Bing Zhang ; Yunlin Chen ; Ao Zhang ; Xiaohan Ke
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 25, 2016
• 年：2016
• 卷：8
• 期：20
• 页码：12756-12763
• 全文大小：468K
• 年卷期：0
• ISSN：1944-8252

文摘

The photoluminescence (PL) properties of inorganic–organic perovskites can be drastically changed by tuning the halogen composition, especially the Cl content. However, our research demonstrated that in addition to the influence of Cl concentration, the PL emission intensity of CH₃NH₃PbBr₃ strongly depends on the content of CH₃NH₃Br in the coating solution. The effects of CH₃NH₃Br and Cl concentrations on the PL properties of CH₃NH₃PbBr_3–xCl_x were investigated. We found that a strong PL emission intensity of CH₃NH₃PbBr₃ can be obtained from solutions with a high CH₃NH₃Br concentration. The PL emission intensities of CH₃NH₃PbBr_3–xCl_x films were enhanced by adjusting the molar ratio of PbBr to PbCl₂ only in a highly concentrated CH₃NH₃Br environment. Moreover, it was found that an optimum CH₃NH₃Br/PbBr₂/PbCl₂ ratio in the precursor solutions can be used to obtain the strongest PL emission intensity of CH₃NH₃PbBr_3–xCl_x films. Further studies revealed that both CH₃NH₃Br and Cl concentrations significantly influence the CH₃NH₃PbBr_3–xCl_x films evolution, which affects their PL properties.