Publication date: 16th July 2025
Inorganic-organic halide perovskites have been well studied as solar cell material due to their excellent tuneable spectral absorption range, high carrier mobility, extended carrier lifetime and significant diffusion length [1]. The stability of these 3D perovskites is still the main issue and hinders the application of these materials. 2D Ruddlesden-Popper-type perovskites have recently attracted a lot of interest as an alternative to the 3D halide perovskites due to their promising stability as compared to their 3D counterparts. The introduction of a large organic cation into 3D framework reduces the dimensionality resulting in a complex layered structure. The hydrophobic nature of large organic spacer cation enhances the moisture stability of the compound and the alternating organic and inorganic layers introduces quantum and dielectric confinement effects, leading to unique optical and electronic behaviours [2,3]. In this work, quasi 2D Formamidinum based hybrid halide single crystals were synthesized using Phenethylamine (PEA) as an organic spacer cation. The synthesized single crystals are comprehensively analysed to assess their fundamental properties. X-ray diffraction (XRD)confirmed the phase purity of the crystals, while differential scanning calorimetry (DSC) indicated reversible phase transitions- Furthermore, these crystals demonstrate improved ambient stability.
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