Structural, optical, and electrical dynamics of Cs 3 Fe 2 Cl 9 : a lead-free triple perovskite candidate for advanced optoelectronics
Abstract
, as confirmed by X-ray diffraction. The refined lattice parameters indicate better crystallinity and structural strength. Optical absorption measurements show a strong response in the ultraviolet range, with an indirect band gap of about 2.8 eV and a low Urbach energy of 0.98 eV, suggesting a lower density of defect states. Infrared spectroscopy reveals vibrational features characteristic of bioctahedral groups, thereby confirming the structural architecture of our compound. Electrical testing through AC conductivity measurements reveals thermally stimulated charge carrier hopping with activation energy near 1.38 eV. Conductivity increases with temperature, showing a shift in the conduction mechanism from orientational localized polaron hopping (single polaron hopping) at lower temperatures to more effective translational movement at higher temperatures.
Fields of Study & Subjects
Perovskite Materials and Applications
Heusler alloys: electronic and magnetic properties
Inorganic Chemistry and Materials
Publication details
- Journal / source
- RSC Advances
- Publisher
- Royal Society of Chemistry (RSC)
- Volume
- 16
- Issue
- 2
- Pages
- 1095–1107
- Publication date
- 1 January 2026
- Language
- EN