Current-Voltage Characteristics of Nb2O5 nanoporous via light illumination

• Published in: IOP conference series. Materials Science and Engineering Vol. 340; no. 1
• Main Authors: Khairir, Nur Samihah, Rani, Rozina Abdul, Hanim Abdullah, Wan Fazlida, Mamat, Mohamad Hafiz, Kadir, Rosmalini Abdul, Rusop, M., Zoolfakar, Ahmad Sabirin
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.03.2018
• Subjects: Anodizing; Current voltage characteristics; Electron transfer; Energy bands; Energy gap; Evaporators; Foils; Illumination; Luminous intensity; Niobium oxides; Orthorhombic phase; Pore size; Space charge
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/340/1/012001

This work discussed the effect of light on I-V characteristics of anodized niobium pentoxide (Nb2O5) which formed nanoporous structure film. The structure was synthesized by anodizing niobium foils in glycerol based solution with 10 wt% supplied by two different voltages, 5V and 10V. The anodized foils that contained Nb2O5 film were then annealed to obtain an orthorhombic phase for 30 minutes at 450°C. The metal contact used for I-V testing was platinum (Pt) and it was deposited using thermal evaporator at 30nm thickness. I-V tests were conducted under different condition; dark and illumination to study the effect of light on I-V characteristics of anodized nanoporous Nb2O5. Higher anodization voltage and longer anodization time resulted in higher pore dispersion and larger pore size causing the current to increase. The increase of conductivity in I-V behaviour of Nb2O5 device is also affected by the illumination test as higher light intensity caused space charge region width to increase, thus making it easier for electron transfer between energy band gap.