Investigation of Pr7O12 thin-film-based Cu/Pr7O12/n-Si MIS Schottky barrier diodes for enhanced photosensitivity

The present novel interface approach for developing high-performance Cu/Pr₇O₁₂/n-Si MIS photodiodes using Jet Nebulizer Spray Pyrolysis (JNSP) is aimed at optoelectronic biosensing applications. By modulating the Pr₇O₁₂ precursor concentration, we achieved controlled film morphology, band structure, and interface quality. Structural analysis confirmed the formation of rhombohedral Pr₇O₁₂ with enhanced crystallinity, while morphological evolution from granular to lamellar features promoted efficient charge transport. Optical studies revealed tunable band gaps ranging from 3.90 to 3.37 eV, enabling spectral sensitivity for targeted bio-optoelectronic integration. Electrical characterization revealed strong rectifying behaviour and elevated Schottky barrier heights (0.72–0.76 eV), indicating improved interface states. The optimized 0.20 M device exhibited an outstanding photosensitivity of 220.72%, highlighting its capability for sensitive light-assisted biosignal detection. This work highlights the potential of JNSP-fabricated Pr₇O₁₂ films as scalable, high-performance photodiode and optoelectronic platforms for future electronic systems that require precise light–biomolecule interactions and detection.