Influence of film thickness and annealing atmosphere on the structural, optical and luminescence properties of nanocrystalline TiO2 thin films prepared by RF magnetron sputtering

Nair, Prabitha B.; Justinvictor, V. B.; Daniel, Georgi P.; Joy, K.; Thomas, P.V.

doi:10.1007/s10854-013-1117-2

Cited by 16 publications

(9 citation statements)

References 30 publications

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“…We deposited one, two, and three layers. Nair et al confirmed the effects of film thickness on the structural, optical, and luminescence properties of TiO 2 prepared by radio frequency magnetron sputtering [21]. We expect that the film thickness also affects the efficiency of the solar cell.…”

Section: Resultsmentioning

confidence: 78%

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

Rahman¹,

Rokhmat²,

Yuliza³

et al. 2016

Int J Energy Environ Eng

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We propose a solar cell design using the combination of titanium dioxide (TiO 2 ) and graphite as active photon absorbing materials. TiO 2 absorbs photons of nearly ultraviolet wavelengths to produce electron-hole pairs, while graphite is expected to absorb photons of longer wavelengths. Although many authors have claimed that graphite is a semimetal, we observed that a model of a solar cell containing TiO 2 only as the active material behaves exactly the same as a model containing graphite only as the active material. Additionally, we observed that a model of a solar cell made using a composite of TiO 2 and graphite as the active material had much higher efficiency than solar cells made using TiO 2 -or graphite-only active materials. Although the highest efficiency we report here is approximately 1 %, our proposed solar cell structure is promising for mass application, especially in low-income settings, owing to its easy and flexible fabrication, and easy largescale application.

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Section: Resultsmentioning

confidence: 78%

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

Rahman¹,

Rokhmat²,

Yuliza³

et al. 2016

Int J Energy Environ Eng

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“…As film growth progresses with increase in sputtering time, more and more molecules reach the substrate. Thickness of the deposited film increases and on subsequent annealing grain growth is promoted, which improves the crystallinity [20].…”

Section: Experimental Studiesmentioning

confidence: 99%

Thickness dependence of structural, optical and luminescence properties of BaTiO3 thin films prepared by RF magnetron sputtering

Maneeshya¹,

Anitha²,

Thomas³

et al. 2015

J Mater Sci: Mater Electron

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BaTiO 3 thin films were deposited onto quartz substrates by RF magnetron sputtering. X-ray diffraction pattern showed the formation of BT thin films with a tetragonal structure with orientations along (101) plane. Average crystallite size increased from 12.52 to 14.87 nm as the film thickness increased from 207 to 554 nm. With the increase in film thickness, the structural disorder decreases and the crystalline quality of the films gradually improved. The film exhibited good adherence to the substrate and are crack free. X-ray photoelectron spectroscopy revealed the presence of barium, titanium and oxygen in BT film. An average transmittance of [80 % was observed for all the films. This high transmittance BT films in the visible region is suitable for various electro-optic applications. The transmittance spectra showed high UV-shielding properties. Optical band gap was found to decrease from 4.55 to 3.70 eV with increase of film thickness, whereas the refractive index was found to increase. The refractive index of the BT films can be tuned between 2.11 and 2.21 at 550 nm. The real and imaginary dielectric constants with increase in film thickness were investigated. The low dissipation factor of BT thin films makes it a promising material for frequency agile applications. The emission spectra of BT thin films consist of near band edge excitonic UV emission and defect related emission in the visible range. The PL emission bands in UV and visible region of BT thin films make them suitable for electro-optic devices and light emitters.

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“…The ripples observed in the spectra can be ascribed to the optical interference in films due to the RI mismatch between the films and the substrates. 23 Thermal stability of the films Figure 3 represents the TGA curves of resultant gel powders. There are three weight loss stages in the TGA curves.…”

Section: Resultsmentioning

confidence: 99%

Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation

et al. 2015

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Silicone/titania hybrids for LED encapsulation were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains. Crack-free thick films ($1 mm) were fabricated by curtain painting. The hybrid films with different Ti contents were characterized by FTIR, UV-VIS, TGA/ DSC, AFM, TEM, ellipsometer, etc. Results show that the hybrid films contain long alkyl chains which have high thermal stability against yellowing owing to the steric hindrance given by long alkyl chains. The hybrid films have high transmittance ( ‡98% in visible range) and high refractive index (1.591-1.681). In LED encapsulation, the silicone/titania hybrids with an RI of 1.605 increased the light extraction efficiency of bare blue LEDs by 19.4%.

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Influence of film thickness and annealing atmosphere on the structural, optical and luminescence properties of nanocrystalline TiO2 thin films prepared by RF magnetron sputtering

Cited by 16 publications

References 30 publications

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

New design of potentially low-cost solar cells using TiO2/graphite composite as photon absorber

Thickness dependence of structural, optical and luminescence properties of BaTiO3 thin films prepared by RF magnetron sputtering

Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation

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