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Published on: March 27, 2018
An above-room-temperature ferroelectric two-dimensional halide double perovskite with direction dependent properties
Shubham Ajaykumar Rajput1, Sudhadevi Antharjanam2, Aravind Kumar Chandiran1
1Department of Chemical Engineering, Indian Institute of Technology Madras, Adyar, Chennai, Tamil Nadu, 600036, India. aravindkumar@iitm.ac.in.
Abstract:
Herein, we introduce a new non-centrosymmetric 2D halide double perovskite Cl0.26Br3.74PA4AgSbBr8 (CPAS) with A-site linker, 3-chloropropylamine. CPAS exhibits above room-temperature ferroelectricity, with spontaneous polarization of 3.4 μC cm-2. The polarization is direction dependent, where ferroelectricity is observed perpendicular to octahedral sheets but mere capacitive phenomena between the sheets. The material shows defect- or phonon-mediated charge conduction. The optical properties reveal a bandgap of 2.48 eV with blue emission.
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