Title Suppression of phase transitions and glass phase signatures in mixed cation halide perovskites /
Authors Šimėnas, Mantas ; Balčiūnas, Sergejus ; Wilson, Jacod N ; Svirskas, Šarūnas ; Kinka, Martynas ; Garbaras, Andrius ; Kalendra, Vidmantas ; Gagor, Anna ; Szewczyk, Daria ; Sieradzki, Adam ; Mzczka, Miroslaw ; Samulionis, Vytautas ; Walsh, Aron ; Grigalaitis, Robertas ; Banys, Jūras
DOI 10.1038/s41467-020-18938-z
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Is Part of Nature communications.. London : Nature Publishing Group. 2020, vol. 11, art. no. 5103, p. [1-9].. eISSN 2041-1723
Keywords [eng] phase transition ; dielectric properties ; single crystal
Abstract [eng] Cation engineering provides a route to control the structure and properties of hybrid halide perovskites, which has resulted in the highest performance solar cells based on mixtures of Cs, methylammonium, and formamidinium. Here, we present a multi-technique experimental and theoretical study of structural phase transitions, structural phases and dipolar dynamics in the mixed methylammonium/dimethylammonium MA1-xDMAxPbBr3 hybrid perovskites (0 ≤ x ≤ 1). Our results demonstrate a significant suppression of the structural phase transitions, enhanced disorder and stabilization of the cubic phase even for a small amount of dimethylammonium cations. As the dimethylammonium concentration approaches the solubility limit in MAPbBr3, we observe the disappearance of the structural phase transitions and indications of a glassy dipolar phase. We also reveal a significant tunability of the dielectric permittivity upon mixing of the molecular cations that arises from frustrated electric dipoles.
Published London : Nature Publishing Group
Type Journal article
Language English
Publication date 2020
CC license CC license description