The Impact of Piezoelectricity in Low Dimensional Metal Halide Perovskite
Stav Rahmany, Adva Shpatz Dayan, Małgorzata Wierzbowska, Amanda Jiamin Ong, Yun Li, Shlomo Magdassi, Alfred Iing Yoong Tok, Lioz Etgar
Abstract
High Resolution Image Download MS PowerPoint Slide Hybrid perovskites show piezoelectric properties due to polarization and centro-symmetry breaking of PbX 6 pyramids (X = I-, Br-, Cl-). This study examines the piezoelectric response of quasi-2D perovskites using various barrier molecules: benzyl amine (BzA), phenylethyl amine (PEA), and butyl diamine (BuDA). Utilizing piezoelectric force microscopy measurements, we determine the piezoelectric coefficient (d 33 ) where BuDA exhibits a substantial response with values of 147 pm V –1 for n = 5, better than the other quasi-2D and 3D perovskite counterparts. Density functional theory calculations reveal distorted bond angles in the PbBr 6 pyramids for quasi-2D perovskites, enhancing symmetry breaking. Additionally, polarizabilities and dielectric constants, derived from ab initio many-body perturbation theory, are highest for BuDA, followed by PEA and BzA, aligning with experimental results. We demonstrate pressure sensor performance, emphasizing the quicker capacitance decay time of the quasi-2D perovskite based on BuDA. This research underscores the impact of perovskite dimensionality on piezoelectricity, paving the way for the development of sensitive and wide-ranging pressure sensors.