Humidity Stability of 2D Dion–Jacobson-Phase Perovskites with Hydrophobic Groups in Diammonium Spacers

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Two-dimensional (2D) Dion–Jacobson-phase layered perovskites have received widespread attention for their better stability and superior photoelectric properties. In this work, the structure, optical properties, and stability of CHBMAPbI 4, OBEAPbI 4, and BDAPbI 4 with different spacer cations were investigated. The structural changes during moisture erosion were detected based on the X-ray diffraction (XRD) patterns and ultraviolet–visible (UV–vis) diffuse reflectance spectra; the results demonstrate that CHBMAPbI 4 with 1,3-cyclohexyl groups and OBEAPbI 4 with alkoxy groups remained stable in high-humidity environments, while CHBMAPbI 4 was more stable due to the weaker polarity of 1,3-cyclohexyl groups, suggesting that the hydrophobic functional groups in diammonium spacers play a role in improving the humidity stability of perovskites.