Akademik Veri Yönetim Sistemi
JOURNAL OF PHYSICS D-APPLIED PHYSICS, cilt.58, sa.47, 2025 (SCI-Expanded, Scopus)
This study reports the successful synthesis and characterization of samarium oxide nanoparticles (Sm2O3 NPs) and their integration into a high-performance Au/Sm2O3/n-Si heterojunction photodetector. Scanning electron microscope /x-ray spectroscopy analyses revealed that the synthesized Sm2O3 NPs form a porous film composed of mixed-shaped particles, confirming the deposition of high-purity Sm2O3 on n-Si substrate. Ultraviolet-visible spectroscopy indicated strong ultraviolet (UV) absorption in the 345-430 nm range and a direct band gap of 3.4 eV, consistent with previously reported values for Sm2O3 nanostructures. X-ray photoelectron spectroscopy analysis further confirmed the chemical composition and surface chemistry of the NPs. To evaluate their device potential, Sm2O3 NPs films were deposited on n-type silicon substrates to fabricate Au/Sm2O3/n-Si heterojunction photodetectors. The devices exhibited excellent rectifying behavior and a notable self-powered photoresponse. Under 395 nm UV illumination at zero bias, the device demonstrated a photoresponsivity of 0.1 A W-1, a specific detectivity of 1.04 x 1012 Jones, a noise-equivalent power (NEP) of 8.5 x 10-14 WHz-0.5, and a normalized photo-to-dark current ratio (NPDR) of 4.48 x 108 W-1. Stability tests, assessed through initial and 90 d I-V measurements, showed a minor decline in performance while maintaining functional operation. These results highlight the promise of Sm2O3-based heterostructures for, wavelength-selective, and self-powered UV photodetectors.