Photo-detector diode based on thermally oxidized TiO2 nanostructures/p-Si heterojunction

Abstract

Titanium oxide (TiO2)-based photodetectors were fabricated using a thermal oxidation technique. The effect of two different annealing temperatures on morphology, structure, and I-V characteristics has been investigated. TiO2/Si heterostructure exhibited diode-like rectifying I-V behavior both in dark and under illumination. Dependence in photoresponse on annealing temperature was observed that was related to effective surface area of quasi-one-dimensional TiO2 nanostructures. Fabricated TiO2/Si diodes in 850 °C as the lower annealing temperature showed higher responsivity and sensitivity compared with grown ones in 950 °C (R850 °C/R950 °C ∼ 5 and S850 °C/S950 °C ∼ 1.6). Rather good photoresponse and simple fabrication process make the 850 °C-TiO2/Si diode a promising candidate for practical applications.

Low-cost photodetector architectures fabricated at room-temperature using nano-engineered silicon wafer and sol-gel TiO2 – based heterostructures

“…It was already proposed to improve the photo-responsivity of TiO 2 -based photodetectors by forming a heterojunction with other narrow bandgap materials like Si to extend its detectivity to the visible 11,12 . Hence, fabricating heterojunction using silicon and TiO 2 can help absorbing light across the UV and the visible 13 . However, most efforts have focused on improving the detection properties using crystalline TiO 2 14 .…”

“…Using nanostructured materials can significantly improve the performances of such heterojunction-based devices 15–18 . Indeed, TiO 2 nanostructuring has been previously used to boost responsivity from Si-TiO 2 photodetectors 13 . Crystalline TiO 2 nanorods have also been successfully used to similar ends 19,20 .…”

A Flexible Smart Monitoring System for the Conservation of Textile Relics

“…Under UV light periodically on/off condition, the photocurrent also decayed to its saturation and rose periodically, which suggested the as‐synthesized photo sensing fiber has a timely and accurate response to ultraviolet light. [ 26 ] The reproducibility of the sensing fibers was verified with insignificant fluctuations (Figure S7, Supporting Information).…”

Anharmonicity induced faster decay of hot phonons in rutile TiO2 nanorods: a Raman spectromicroscopy study

“…Amongst these, Titanium oxide (TiO 2 ) has been considered as "functional building block" which can be appreciated from the quantum in which this material is manufactured (millions of tons) for various applications as pigment, paint additive, and sunscreen to name a few simplest uses leaving the sophisticated applications in optoelectronics, catalysis, biomedical, energy and environmental applications [4][5][6][7][8][9] . Nanostructures of TiO 2 [10][11][12][13][14] shows exclusive interest due to its chemical stability and low toxicity 15,16 . Under ambient conditions, TiO 2 is known to exist in eight crystalline polymorphs 17 , of which only three, namely, rutile (tetragonal) 18 , anatase (tetragonal) 19 and brookite (orthorhombic) phases occur naturally 20,21 .…”