Phonon Driven Ferroelectricity and Raman Active Modes in Hybrid Organic-Inorganic Perovskites.

ABSTRACT: Hybrid organic-inorganic perovskites (HOIPs) have emerged as promising ferroelectric semiconductors, yet the phonon signatures governing their ferroelectricity remain poorly understood. Here, by analyzing the temperature-dependent Raman peak profiles of highly ordered ferroelectric domains in HOIPs, a framework to systematically investigate the dimensionality (n)-dependent phonons that are critical to ferroelectric behaviour is established. By tracking phonon evolution across the ferroelectric-to-paraelectric phase transition in HOIPs with different n, characteristic modes associated with the ferroelectric symmetry-breaking process are identified. Notably, in the ferroelectric phase of (BA)₂(MA)₂Pb₃Br₁₀ (n = 3), these modes exhibit a redshift com

SUBMITTER: Li C 

PROVIDER: S-EPMC12369693 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature