Volume 43, Issue 9 pp. 1029-1034
Concise Report

Halogen Modulation and Physical Property Variation in Two Novel Mixed-Cation Organic-Inorganic Hybrid Perovskites

Xiaomei Fu

Xiaomei Fu

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

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Zining Zhou

Zining Zhou

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

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Yawen Yang

Yawen Yang

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

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Lei He

Lei He

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

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Jie Mu

Jie Mu

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

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Qiong Ye

Corresponding Author

Qiong Ye

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

E-mail: [email protected]Search for more papers by this author
First published: 11 February 2025
Citations: 4

Dedicated to the Special Issue of Emerging Investigators in 2024.

Comprehensive Summary

Organic-inorganic hybrid perovskites (OIHPs) offer precise control over material properties through the substitution of organic cations and halogens. In this study, two OIHPs, [(C6H10P)(n-BA)]Sb2X9 ([C6H10P]+ = [Me3PCH2CH2CH3]+, [n-BA]+ = n-butylamine cation, X = I (1), Br (2)), were synthesized by varying halogens within a mixed-cation system. The halogen substitution induced a shift from compound 1, which remains stable without phase transitions, to compound 2, which undergoes a ferroelastic phase transition (mmmF2/m). Compound 1 crystallizes in the non-centrosymmetric Pca21 space group and demonstrates a second harmonic generation (SHG) response, while compound 2 displays elasticity in nanoindentation tests. Halogen substitution alters Sb—X bond lengths, inducing structural distortions in the inorganic framework and influencing the spatial configuration of organic cations and inorganic anions. These changes lead to distinct crystallization behaviors, resulting in different physical properties for compounds 1 and 2. This work contributes to the development of multifunctional materials based on halogen regulation in mixed-cation OIHPs.

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