Title: 

Crystalline Intermarriage of Hybrid Organic–Inorganic Halide Perovskite and Epoxide: Enhanced Stability and Modified Optical Properties

Abstract:

Stability is one of the major issues for hybrid organic–inorganic halide perovskites. In the organic aspect, increased hydrophobicity can be beneficial to the enhanced stability. Different from the previous R group hydrophobic modification in an organic R-NH3+ cation, herein, NH3+ modification using epoxide is reported to improve the stability of hybrid halide perovskites. We integrate the chiral propylene oxide (PO) into HDAPbI4 (HDA = 1,6-hexamethylenediamine) through the grafting of PO onto HDA. The −NH3+ hydrophobic modification is very favorable for stability improvement. As a result, the resultant (R/S-PO-HDA)PbI4 thin film is stable in water for more than 1 h, whereas the untreated HDAPbI4 thin film decomposes immediately. Moreover, (R/S-PO-HDA)PbI4 could keep the photoelectricity of HDAPbI4 and the chirality of PO. This work could inspire further study on the perovskite-based epoxide polymer.

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https://pubs.acs.org/doi/10.1021/acsaem.1c02139