title: (CH3NH3)2PdCl4: A Compound with Two-Dimensional Organic-Inorganic Layered Perovskite Structure.
abstract: The synthesis of previously unknown perovskite (CH3NH3)2PdCl4is reported. Despite using an organic cation with the smallest possible alkyl group, a 2D organic-inorganic layered Pd-based perovskites was still formed. This demonstrates that Pd-based 2D perovskites can be obtained even if the size of the organic cation is below the size limit predicted by the Goldschmidt tolerance-factor formula. The (CH3NH3)2PdCl4phase has a bulk resistivity of 1.4 Ω cm, a direct optical gap of 2.22 eV, and an absorption coefficient on the order of 104cm-1. XRD measurements suggest that the compound is moderately stable in air, an important advantage over several existing organic-inorganic perovskites that are prone to phase degradation problems when exposed to the atmosphere. Given the recent interest in organic-inorganic perovskites, the synthesis of this new Pd-based organic-inorganic perovskite may be helpful in the preparation and understanding of other organic-inorganic perovskites.
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.|Singapore Institute of Manufacturing Technology (SIMTech), 71 Nanyang Drive, 638075, Singapore.|NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore.
authors.forename: Tang Jiao
authors.initials: TJ
authors.lastname: Huang
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Zhang Xian
authors.initials: ZX
authors.lastname: Thiang
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Xuesong
authors.initials: X
authors.lastname: Yin
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Tang
authors.affiliation: Singapore Institute of Manufacturing Technology (SIMTech), 71 Nanyang Drive, 638075, Singapore.
authors.forename: Guojun
authors.initials: G
authors.lastname: Qi
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore. msegongh@nus.edu.sg.
authors.forename: Hao
authors.initials: H
authors.lastname: Gong
keywords: layered compounds; organic-inorganic hybrid composites; palladium; perovskite phases; structure elucidation