Nanoparticles (NPs), nanotubes, rods, and sheets made of rare earth metals have recently become the material of choice for many device applications. This study aims to synthesise Y₂O₃ nanoparticles using the laser ablation technique in two different liquid media (deionized water and ethanol) and investigate their structural, morphological, optical, and chemical properties, as well as to evaluate the performance of Ag/Y₂O₃/n-Si/Ag heterojunction UV photo-detectors based on the prepared nanopartic