Electrical conduction mechanism in polycrystalline titanium oxide thin films

Mardare, Diana; Rusu, G.I.

doi:10.1016/j.jnoncrysol.2010.05.049

Cited by 14 publications

(12 citation statements)

References 24 publications

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“…It is well known that the titanium oxide thin films are transparent in the visible range, and absorbent in ultraviolet, their absorption edge being situated in the near UV range, having values depending on their phase content. 18,19 The absorption coefficient, a, can be obtained from the following relation: 20 T ¼ ½ð1 À RÞ 2 expðÀadÞ=½1 À R 2 expðÀ2adÞ;…”

Section: Resultsmentioning

confidence: 99%

“…In the vicinity of the fundamental absorption, we may consider that the indirect allowed transition dominates over the optical absorption, according to the relation: 18,19 ðahÞ 1=2 ¼ A i ðh À E g Þ;…”

Section: Resultsmentioning

confidence: 99%

“…The values of E g are much higher than those reported in the literature (3.11 eV for the rutile phase 21 and 3.2 eV for the anatase phase 22 ), or than those previously obtained in our former studies. 18,19 An explanation might be related to the size quantum effects, the thickness of the films under study being lower than 100 nm, while in Refs. 18 and 19, we dealt with thicker films (>250 nm).…”

Section: Resultsmentioning

confidence: 99%

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Surface wettability of titania thin films with increasing Nb content

Mardare

Yıldız

Gîrtan

et al. 2012

Journal of Applied Physics

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TiO 2 and TiO 2 /Nb amorphous thin films were grown on glass substrates by a sol-gel technique (spin coating). Films' surface composition, structure, and morphology were derived from x-ray photoelectron spectroscopy, x-ray diffraction, and atomic force microscopy data. The investigated films showed a smooth surface (roughness values below 5 nm). A separate surface wettability investigation showed that by increasing the Nb amount in pristine titania films results in a decrease of contact angle (CA) values from 40 to nearly 0 , thus, indicating a super-hydrophilic conversion under UV illumination. This conversion rate is greatly enhanced by increasing the Nb content, the surface super-hydrophilic behavior occurring after a couple of minutes in the TiO 2 /Nb samples, but after 4 h in the pristine titania specimen. The current results are discussed in terms of the optical band gap shift towards higher energies, by increasing the Nb content in the films, a process explained based on small polaron hopping model. V

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Surface wettability of titania thin films with increasing Nb content

Mardare

Yıldız

Gîrtan

et al. 2012

Journal of Applied Physics

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“…This is ten times higher than the value found for anatase single crystals [87] and 3 to 7 times higher than observed for polycrystalline samples. [88][89][90] Reasons are possible a looser packing of crystallites in the pelletized sample or a different mean crystallite size. Thus, density and type of dopants, surrounding atmosphere, UV-irradiation and anatase/rutile ratio will as well affect the materials conductivity and activation energy.…”

Section: Impedance Measurements Of Ccs10mentioning

confidence: 99%

CuCo₂S₄Deposited on TiO₂: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

et al. 2020

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Metallic spinel-type CuCo 2 S 4 nanoparticles were deposited on nanocrystalline TiO 2 (P25®), forming heterostructure nanocomposites. The nanocomposites were characterized in detail by X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), nitrogen sorption (BET) and UV/Vis spectroscopy. Variation of the CuCo 2 S 4 :TiO 2 ratio to an optimum value generated a catalyst which shows a very

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“…The conductivity, transparency and structure can be influenced by many parameters of sputtering conditions such as energy, angle of incidence, etc. of the impinging atoms [4], temperature of substrate Ts [6][7][8], target-substrate distance Dts and the geometrical configuration of the system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Substrate Temperature and Target-Substrate Distance on Growth of TiO2 Thin Films by Using DC- Reactive Sputtering Technique

et al. 2014

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Titanium oxide (TiO 2 ) thin films have been deposited by a DC sputtering technique onto microscope glass slides. The effect of substrate temperature (Ts) and target-substrate distance (Dts) on some optical and electrical properties have been studied each individually. The structure of TiO 2 thin films has been improved and became more crystalline when Ts has been increased (from 150 ºC to 250 ºC). The conductivity (ϭ), deposition rate (D R ) and average values of grain size (G.S) have been increased with increasing Ts while the values of band gap (Eg) and weight percentage of the anatase phase (W A ) have been decreased. The thickness of TiO 2 film has been increased from 920 nm to 960 nm with increase Ts while it has been decreased from 960 nm to 680 nm with increase Dts (from 25mm to 35mm). As Dts has been increased, the conductivity ϭ, thickness (d) and average values of grain size have been decreased. The decreasing of conductivity at Dts=35 maybe attributes to increase the weight percentage of the rutile phase (W R ). The XRD results show that the TiO 2 structure phase has been varied. The results show that the optical and electrical properties of TiO 2 film affected by changes the condition parameters especially Ts and Dts as well as the density and energy of the impinging atoms. The surface morphology and component of TiO 2 thin films, resistance, optical transmittance and structure of film were characterized by SEM (EDX), I-V meter, UV-VIS spectrophotometer and XRD respectively.

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Electrical conduction mechanism in polycrystalline titanium oxide thin films

Cited by 14 publications

References 24 publications

Surface wettability of titania thin films with increasing Nb content

Surface wettability of titania thin films with increasing Nb content

CuCo₂S₄Deposited on TiO₂: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

Effect of Substrate Temperature and Target-Substrate Distance on Growth of TiO2 Thin Films by Using DC- Reactive Sputtering Technique

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Electrical conduction mechanism in polycrystalline titanium oxide thin films

Cited by 14 publications

References 24 publications

Surface wettability of titania thin films with increasing Nb content

Surface wettability of titania thin films with increasing Nb content

CuCo2S4Deposited on TiO2: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

Effect of Substrate Temperature and Target-Substrate Distance on Growth of TiO2 Thin Films by Using DC- Reactive Sputtering Technique

Contact Info

Product

Resources

About

CuCo₂S₄Deposited on TiO₂: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution