Structural Dynamics in 2D Organic-Inorganic Hybrids: Role of Spacer Architecture

Two-dimensional (2D) organic-inorganic hybrid compounds have garnered significant attention for their tunable optoelectronic properties, structural flexibility, and potential applications in photovoltaics, light-emitting devices, and quantum materials. Among these, Cu-based compound A2CuCl4 (A= butylammonium(BA); ethylammonium (EA), and phenylethylamine (PEA)) system offers a unique platform to investigate the interplay between structural dynamics and the spacer architecture. Size of organic spacers in such layered perovskites plays a crucial role in determining phase stability, phonon interactions, and anharmonic lattice dynamics. In this study, we propose to use quasielastic neutron scattering (QENS) to probe the structural dynamics of A2CuCl4 (A= BA, EA, PEA) as a function of architecture of organic spacer.