Sol-Gel Synthesis and Characterization of TiO2 Nano Films in the Building of Dssc

Maheswari, D. Uma

doi:10.9790/2834-0442933

Cited by 6 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The gel was heat treated at different temperatures ca, 550, 750 and 900 o C for 1h in an electrically heated muffle furnace with heating rate of 5 o C/ minute. All the samples were characterized by X-ray diffraction (XRD) [Model Regaku ultima-III], The grain size of the samples was calculated using Scherrer equation [11] as given below…”

Section: Methodsmentioning

confidence: 99%

Spectroscopic Investigation on Sol Gel Derived TiO<sub>2</sub> Nanoparticles

Singh¹,

Mukherjee²,

Ghosh³

et al. 2017

JAN

View full text Add to dashboard Cite

Abstract. TiO 2 nanoparticles were synthesized by sol-gel method from titanium tetra isopropoxide. Influence of heat treatment on structural and morphological properties of TiO 2 nanoparticles was investigated by XRD and SEM. Spectral properties of the nanoparticles were investigated using FTIR, Raman spectroscopy, PL spectroscopy and UV-visible absorption spectroscopy. XRD analysis revealed the formation of mixed anatase and ruitle phase in the synthesized powder at 550 o C and existence of only rutile phase at 750 and 900 o C. The lattice parameters, crystallite sizes, volume of the unit cell, density and surface area of TiO 2 nanoparticles were determined from XRD analysis. SEM analysis showed that the prepared nanoparticles were in the nano regime, nearly spherical and larger agglomerated at lower temperature. EDX analysis showed that the TiO 2 composition obtained was near stoichiometric at lower temperature and the proportion of oxygen vacancy increased with the increase in temperature. The presence of Ti-O and Ti-O-Ti bonds was confirmed by FTIR spectra. PL spectroscopy showed that the change in surface states and presence of anatase and rutile phases of TiO 2 were also responsible for exhibiting the change in PL intensity. UV-visible absorption spectra showed the shifting of absorption edge towards the higher wavelength with the increase in temperature while the corresponding energy band gap of semiconductor nanoparticles decreased. Change in Raman spectra with the increase in temperature was observed due to anatase to rutile phase transformation and with the increase in the particle size.Keywords: TiO 2 nanopowder, sol-gel, annealing, spectroscopic properties. IntroductionTitania nanoparticles have important applications in the field of optical devices, sensor and photocatalysis [1,2]. These nanoparticles have different electrical, optical and magnetic properties compared to their bulk counterparts due to large surface to volume ratios and quantum size effect [3]. There are several factors in determining the important properties like, particle size, crystallinity and morphology that affect the performance of TiO 2 in applications [4][5][6]. TiO 2 as a wide indirect band gap n-type semiconductor and generally exist in the three polymorphs of TiO 2 are anatase (I4/amd), rutile (P42/mnm) and brookite (Pcab). Brookite exists in an orthorhombic structure while anatase and rutile both possess tetragonal unit cells. Among these, anatase is metastable at lower temperature and has excellent chemical and physical properties for environmental purification, although rutile is the more stable phase from thermodynamic point of view. The phase composition has significant effect on the properties and performance of nano TiO 2 and therefore it is desirable to control the transformation to develop a particular phase or phase mixture subsequent to thermal treatment. The phase transformation depends on the growth process affected by defect concentration, grain boundary concentration and particle packing as well [7][8][9]. ...

show abstract

Section: Methodsmentioning

confidence: 99%

Spectroscopic Investigation on Sol Gel Derived TiO<sub>2</sub> Nanoparticles

Singh¹,

Mukherjee²,

Ghosh³

et al. 2017

JAN

View full text Add to dashboard Cite

show abstract

“…In DSSC, the light absorption and the separation of the electrical charges happens in different processes. The light absorption process is performed by the dte molecules and the separation of the electrical charges is done by the nanocrystal inorganic semiconductor (Maheswari and Venkatachalam, 2013). The photoexcited electrons in the dye sensitizer are injected into the conduction band of the nanocrystalline semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Yumbo Tumtum as a Photosensitizer in the Fabrication of a Dye-Sensitized Solar Cell

2016

ILJS

View full text Add to dashboard Cite

A dye-sensitized solar cell (DSSC) was fabricated using a natural dye Yombo-tumtum (YT) as the photosensitizer. The solar cell configuration include a transparent conducting oxide (TCO) (Fluorine-doped tin oxide coated glass or FTO/glass) substrate as the transparent electrode, Zinc oxide (ZnO) as anode, YT as the sensitizer, iodide/triiodide (I − /I3 − ) as the electrolyte, and platinum coated FTO/glass as counter electrode (cathode). The absorption spectrum of the dye (YT) was investigated by uv/vis spectroscopy, and it revealed high absorbance property within the visible region (400 -700 nm). Fourier transform infrared (FTIR) spectroscopy carried out on the dye (YT) showed its infrared spectrum and revealed the functional group of the dye with major peaks at 3340.71, 2970.38, 1647.21, 1159.22 and 948.98 cm -1 . The photoelectric values obtained under illumination was 31.5mV and 7.5 μA which dropped to17.6 mV and 2.0 µA when the cell was partially covered, indicating the photosensitivity of the device. The current -voltage characteristic values were obtained for the cell fabricated using the dye and the fill factor and the efficiency obtained were 0.5473 and 4.7 x 10 -3 %.

show abstract