An international collaboration, with A. Stroppa (CNR-SPIN), K.P. Loh (NUS), K. Leng (PolyU) as corresponding authors, showed that the polar axis in ferroelectric 2D Dion-Jacobson (DJ) phase hybrid organic-inorganic perovskites (HOIPs) can be switched by almost 90° using halide substitution. In DJ phase (4AMP)PbX4 ferroelectric system (4AMP = 4-(Aminomethyl)piperidine, X= I and Br), by substituting the iodide with bromide element in perovskite layer, the obtained [PbBr4]2- compound presented In-Plane (IP) polar axis, which is in contrast to the all previously reported [PbI4]2- counterparts with Out-of-Plane (OOP) polar axis. (DOI: 10.1021/jacs.3c03921 - https://pubs.acs.org/doi/10.1021/jacs.3c03921?ref=PDF).
"Near-90° Switch in the Polar Axis of Dion–Jacobson Perovskites by Halide Substitution" published in JACS
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