Stable blue emission and sub-gap mediated UV photodetection in lead-free 1D CsCu₂Br₃ single crystals.

ABSTRACT: In this work, we report a comprehensive study of the structural, optical, and photoelectrical properties of one-dimensional (1D) CsCu₂Br₃ single crystals. Powder X-ray diffraction (XRD) confirms the orthorhombic Cmcm phase with excellent crystallinity, while thermogravimetric analysis (TGA) demonstrates thermal stability up to ~ 300 °C, with only a minor (~ 6%) extrinsic mass loss near 287 °C. Optical characterization reveals a direct bandgap of 4.09 eV, a low Urbach energy (0.104 eV), and strong blue photoluminescence (451.6 nm) with a large Stokes shift and unusually broad full width at half maximum (FWHM) (~ 250 nm), indicative of pronounced electron-phonon coupling and self-trapped excitons (STEs). Time-resolved PL yields two recombination channels (τ₁ 

SUBMITTER: Bouzidi M 

PROVIDER: S-EPMC12521380 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature