Toward Fluorinated Spacers for MAPI-Derived Hybrid Perovskites: Synthesis, Characterization, and Phase Transitions of (FC2H4NH3)2PbCl4 | Zendy

Claudia Lermer | Zendy; Susanne T. Birkhold | Zendy; Igor Moudrakovski | Zendy; Péter Mayer | Zendy; Leslie M. Schoop | Zendy; Lukas SchmidtMende | Zendy; Bettina V. Lotsch | Zendy

Open Access

Toward Fluorinated Spacers for MAPI-Derived Hybrid Perovskites: Synthesis, Characterization, and Phase Transitions of (FC₂H₄NH₃)₂PbCl₄

Author(s) -

Claudia Lermer,

Susanne T. Birkhold,

Igor Moudrakovski,

Péter Mayer,

Leslie M. Schoop,

Lukas SchmidtMende,

Bettina V. Lotsch

Publication year - 2016

Publication title -

chemistry of materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.741

H-Index - 375

eISSN - 1520-5002

pISSN - 0897-4756

DOI - 10.1021/acs.chemmater.6b02151

Subject(s) - photoluminescence , perovskite (structure) , materials science , absorption spectroscopy , thermal stability , iodide , spectroscopy , crystallography , crystal structure , phase (matter) , phase transition , chemistry , chemical physics , inorganic chemistry , organic chemistry , optoelectronics , optics , physics , quantum mechanics

The intrinsic moisture sensitivity of the hybrid perovskite methylammonium lead iodide (MAPI) calls for new synthetic strategies to enhance moisture resistance and, thus, long-term stability. Here, we combine two strategies: (i) transitioning from 3D to 2D hybrid perovskites by inserting larger A-site cations as spacers and (ii) using fluorinated linkers to enhance the hydrophobicity of the material—and identify two new hybrid perovskite-type compounds, (FC2H4NH3)2PbCl4 and (FC2H4NH3)PbBr3·DMF, carrying 2-fluoroethylammonium (FC2H4NH3)+ as a promising organic cation for the synthesis of moisture-resistant hybrid perovskites. (FC2H4NH3)2PbCl4 features a two-dimensional structure and pronounced long-term stability as confirmed by single-crystal and powder X-ray diffraction. The observed reversible phase transitions at 87 and 107 °C investigated with thermal analysis, temperature-dependent powder X-ray diffraction measurements, and 1H, 13C, and 207Pb solid-state NMR spectroscopy can be assigned to changes in...

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