Influência do espaçador orgânico em propriedades optoeletrônicas de perovskitas de haleto do tipo Ruddlesden-Popper

Abstract

Two-dimensional Ruddlesden-Popper halide perovskites have become promising materials for the development of optoelectronic devices due to their remarkable optical properties, which can be tailored for different purposes because of the versatility of their crystalline structure. In this work, we explore the influence of molecular tuning of organic spacer cations on the optoelectronic properties of the R2PbI4 crystal, where R is butylammonium (BA), hexylammonium (HA), or phenethylammonium (PEA). Single-crystal X-ray diffraction reveals that the choice of organic cation influences the crystal symmetry. Optical measurements show double-peaked photoluminescence (PL) emission features, with time-resolved PL indicating that emission lifetimes are strongly dependent on the organic cation. The electron-phonon coupling (EPC) was studied based on PL emission spectra at low temperatures and also showed dependence on the spacer. Our results highlight the critical role of the organic spacer structure in tuning EPC and optical properties, offering a pathway for customizing these materials for optoelectronic applications.