Effect of Acid Treatment in Dye Loading Capacity of Spin Coated ZnO Film

In recent times, the research on ZnO is growing tremendously, because of its potential use in many applications such as optical devices, dye sensitized solar cell (DSSC), gas sensors and biomedical. ZnO thin films of various thicknesses were prepared by the spin coating method using the zinc acetate precursor with diethanolamine and ethanol. The structural and optical characterizations of as-prepared ZnO films carried out using XRD and UV-Vis spectrophotometer, respectively. The XRD results showed polycrystalline wurtzite structure of ZnO. The average crystallite size of ZnO as calculated using Debye Scherrer’s formula was 26 nm. The optical band gap of ZnO was found to decrease with film thickness. The dye extracted from the leaves of Tectona Grandis (Sagun) which possesses a high and wide absorbance was used in this experiment. The study on the effect of acid treatment on ZnO films in dye loading showed enhanced absorbance in acid treated ZnO as compared to untreated ZnO.

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Obtainable P-Type ZnO Film Doped with Li by Sol-Gel Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.734.796 ◽

2015 ◽

Vol 734 ◽

pp. 796-801 ◽

Cited By ~ 3

Author(s):

Ting Ting Wang ◽

Miao Miao Dai ◽

Ya Jun Yan ◽

Hong Zhang ◽

Yi Min Yu

Keyword(s):

Hole Concentration ◽

Sol Gel ◽

Green Emission ◽

Hall Effect Measurement ◽

Zno Films ◽

Zno Film ◽

Oriented Growth ◽

Coating Method ◽

Thermal Annealing Process ◽

P Type

A series of Li-doped zinc oxide ( ZnO ) thin films were deposited on quartz glass by sol-gel and spin coating method. Their p-type conductivities could be achieved by subsequently thermal annealing process, which were characterized by Hall effect measurement. An optimized result with resistivity of 46.8 Ω cm, Hall mobility of 1.35 cm2/V s, and hole concentration of 9.89×1016 cm-3 was achieved at the annealing temperature of 700 °C. The films exhibited highly (002) oriented growth in all the cases. Strong green emission centered at 510 nm was observed by photoluminescence spectra in Li-doped ZnO films at room temperature.

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Performances of spin coated silver doped ZnO photoanode based dye sensitized solar cell

Processing and Application of Ceramics ◽

10.2298/pac1703213s ◽

2017 ◽

Vol 11 (3) ◽

pp. 213-219 ◽

Cited By ~ 3

Author(s):

Amrik Singh ◽

Devendra Mohan ◽

Singh Ahlawat ◽

R Richa

Keyword(s):

Solar Cells ◽

Dye Sensitized Solar Cells ◽

Zno Films ◽

Zno Film ◽

Dye Sensitized ◽

Tauc Plot ◽

In Doping ◽

Two Samples ◽

Doped Zno ◽

Sensitized Solar Cells

Dye sensitized solar cells (DSSCs) were fabricated using silver doped ZnO films deposited on ITO glass by spin coating method. The crystalline nature of ZnO films was analysed with XRD and SEM technique was used for morphological studies. The XRD pattern confirmed the presence of single phase hexagonal wurtzite ZnO structure, without the presence of secondary phase. The crystallite size of ZnO decreased from 31 nm to 25 nm with increase in doping to 1.5mol% of silver. The UV-visible transmission of the prepared ZnO film was found to be 70-90% and it decreased with increase in doping to 0.5mol% Ag and increased in the film doped with 1.5mol% Ag. The band gap values of the ZnO films with 0, 0.5 and 1.5mol% of silver, determined from Tauc plot, were 3.269, 3.235 and 3.257 eV, respectively. The absorbance peaks of the N719 dye loaded ZnO films were obtained at the wavelengths 310, 350 and 538 nm. The N719 dye loaded ZnO film doped with 0.5mol% Ag has the highest absorbance in the visible region as compared to other two samples. The fill factor values of the pure and ZnO doped with 0.5 and 1.5mol% Ag were 0.47, 0.48 and 0.42, respectively. The short circuit density values for ZnO, ZnO:Ag0.5% and ZnO:Ag1.5% were found to be 1.50, 1.55 and 1.15 A?m/cm2, respectively. The calculated photon to electron efficiencies for the ZnO films with 0, 0.5 and 1.5mol% of silver were 0.42%, 0.44% and 0.27%, respectively. Consequently future prospective of such type of dopants in ZnO film based dye sensitized solar cells seems to be bright.

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Chemical Modification on Hierarchically Structured ZnO Films for Energy Conversion Efficiency Enhancement of Dye-Sensitized Solar Cells

MRS Proceedings ◽

10.1557/proc-1102-ll06-08 ◽

2008 ◽

Vol 1102 ◽

Author(s):

Qifeng Zhang ◽

Samson A Jenekhe ◽

Guozhong Cao

Keyword(s):

Solar Cells ◽

Energy Conversion ◽

Conversion Efficiency ◽

Dye Sensitized Solar Cells ◽

Energy Conversion Efficiency ◽

Zno Films ◽

Zno Film ◽

Dye Sensitized ◽

Induced Changes ◽

Sensitized Solar Cells

AbstractWe report the synthesis of ZnO aggregates in the presence of lithium salt and the enhancement on the energy conversion efficiency of dye sensitized solar cells when the photoelectrode films consist of as-synthesized ZnO aggregates. The conversion efficiency for ZnO film consisting of aggregates synthesized with lithium involvement is significantly improved up to 5.8%, which is 32% higher than that of 4.4% obtained for pure ZnO film. Such an enhancement can be attributed to the effect of lithium-induced changes on the morphology and crystallinity of aggregates, the optical absorption of films, and the surface chemistry of ZnO, which provides the film with decreased electron trapping and increased refractive index, and enhances the electronic coupling between the dye molecules and ZnO.

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Al-Doped ZnO Film as a Transparent Conductive Substrate in Indoline-Sensitized Nanoporous ZnO Solar Cell.

MRS Proceedings ◽

10.1557/opl.2012.1646 ◽

2012 ◽

Vol 1494 ◽

pp. 345-350

Author(s):

B. Onwona-Agyeman ◽

M. Nakao ◽

G.R.A. Kumara ◽

T. Kitaoka

Keyword(s):

Photovoltaic Performance ◽

Dye Sensitized Solar Cells ◽

Zno Films ◽

X Ray Diffraction ◽

Zno Film ◽

Dye Sensitized ◽

Conductive Substrate ◽

Diffraction Peaks ◽

Doped Zno ◽

Sensitized Solar Cells

ABSTRACTWe have deposited porous ZnO films on aluminum-doped ZnO (ZnO/AZO) and fluorine-doped tin oxide (ZnO/FTO) transparent substrates, and annealed both in air at 500°C. X-ray diffraction measurements of the nanoporous ZnO films after heat treatment showed that, ZnO/AZO film exhibited a dominant (002) diffraction while the ZnO/FTO showed mixed diffraction peaks with the (100) and (101) being dominant. Dye-sensitized solar cells (DSC) based on the sensitization of the porous ZnO films on AZO and FTO substrates with an indoline dye were constructed. The photoaction spectrum, which is a measure of the degree of sunlight harvesting, was broad and higher in the ZnO/AZO DSC than that of the ZnO/FTO DSC. Conversion efficiency of 7.3 % was obtained for the ZnO/AZO DSC while 4.5 % was recorded for the ZnO/FTO. The superior photovoltaic performance of the ZnO/AZO DSC is attributed to better ZnO film orientation after thermal treatment and the higher sunlight harvesting.

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Lawsone Sensitized ZnO Photoelectrodes for Dye Sensitized Solar Cells

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.24.140 ◽

2013 ◽

Vol 24 ◽

pp. 140-145 ◽

Cited By ~ 8

Author(s):

Shubhangi S. Khadtare ◽

Sandesh R. Jadkar ◽

Sunita Salunke-Gawali ◽

Habib M. Pathan

Keyword(s):

Solar Cells ◽

Paradigm Shift ◽

Fossil Fuels ◽

Renewable Energy Sources ◽

Dye Sensitized Solar Cells ◽

Energy Utilization ◽

Zno Films ◽

Dye Sensitized ◽

Dye Loading ◽

Sensitized Solar Cells

Innovations in materials technology in the fields of photovoltaics play an important role in the paradigm shift from fossil fuels to renewable energy sources. The use of solar energy is one of the most important problems in energy utilization. Dye sensitized solar cell (DSSC) technology has been recognized as a competitor to the well developed thin film solar cells. In the present investigation, we have fabricated a device using natural Lawsone (Heena) dye which was used to sensitize zinc oxide (ZnO) films. ZnO seed layer was deposited using chemical bath deposition and slurry was used to deposit ZnO films followed by sintering at 450°C for 30 minutes in air. Performance of nanostructure ZnO photoelectrode using lawsone dye as a function of residence time in the dye solution was studied. For 20 hour dye loading time, we were observed power conversion efficiency around 0.5% which is more as compared to 5 and 14 hours dye loading time.

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SINGLE CRYSTALLINE a-AXIS ZnO THIN FILMS DEPOSITED BY SOL-GEL METHOD FOR OPTOELECTRONIC DEVICES

Modern Physics Letters B ◽

10.1142/s0217984908015139 ◽

2008 ◽

Vol 22 (09) ◽

pp. 685-692 ◽

Cited By ~ 10

Author(s):

M. P. BHOLE ◽

D. S. PATIL

Keyword(s):

Sol Gel ◽

Optoelectronic Devices ◽

Dip Coating ◽

Band Gap Energy ◽

Hexagonal Structure ◽

Zno Films ◽

Zno Film ◽

Single Crystalline ◽

Coating Method ◽

Absorbance Spectra

Undoped a-axis oriented single crystalline zinc oxide ( ZnO ) films were deposited by sol-gel dip-coating method. The films were characterized by X-ray diffraction (XRD) and ultraviolet visible (UV-VIS) absorbance spectra. The films of ZnO were deposited on amorphous microscopic glass substrate at various temperatures. The XRD showed that the ZnO film was crystallized with a hexagonal structure with a strong orientation in the (100) plane, which is exactly along the a-axis and beneficial for the development of optoelectronic devices. The optical band gap energy found for this a-axis oriented ZnO film was 3.30 eV through UV-VIS absorbance spectra. The Fourier Transform Infrared Spectroscopy (FTIR) analysis was carried out by taking the IR absorbance spectra for ZnO film deposited on the silicon substrate at 450°C. It showed that the strong Zn – O stretching bond is present in the deposited film.

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Immobilization of ZnO Suspension on Glass Substrate to Remove Filtration During the Removal of Remazol Red R from Aqueous Solution

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v12i6.6990 ◽

2016 ◽

Vol 12 (6) ◽

pp. 4127-4133

Author(s):

Nazmul Kayes ◽

Jalil Miah ◽

Md. Obaidullah ◽

Akter Hossain ◽

Mufazzal Hossain

Keyword(s):

Aqueous Solution ◽

Glass Substrate ◽

Uv Light ◽

Aqueous Suspension ◽

Light Irradiation ◽

Zno Films ◽

Light Sources ◽

Zno Film ◽

Semiconductor Oxides ◽

Remazol Red

Photodegradation of textile dyes in the presence of an aqueous suspension of semiconductor oxides has been of growing interest. Although this method of destruction of dyes is efficient, the main obstacle of applying this technique in the industry is the time and cost involving separation of oxides from an aqueous suspension. In this research, an attempted was made to develop ZnO films on a glass substrate by simple immobilization method for the adsorption and photodegradation of a typical dye, Remazol Red R (RRR) from aqueous solution. Adsorption and photodegradation of RRR were performed in the presence of glass supported ZnO film. Photodegradation of the dye was carried out by varying different parameters such as the catalyst dosage, initial concentrations of RRR, and light sources. The percentage of adsorption as well as photodegradation increased with the amount of ZnO, reaches a maximum and then decreased. Maximum degradation has been found under solar light irradiation as compared to UV-light irradiation. Removal efficiency was also found to be influenced by the pre-sonication of ZnO suspension.

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Effect of stearic acid treatment on the properties of aligned short hemp fibre mats and their potential use as reinforcement in polypropylene matrix composites

Cellulose ◽

10.1007/s10570-021-03884-w ◽

2021 ◽

Author(s):

Kim L. Pickering ◽

Tom Sunny

Keyword(s):

Stearic Acid ◽

Acid Treatment ◽

Matrix Composites ◽

Hemp Fibre ◽

Polypropylene Matrix ◽

Potential Use

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Facile preparation of new polystyrene leucomalachite green thick films and study of their radiochromic behavior for low doses of gamma radiation

International Journal of Advanced Chemistry ◽

10.14419/ijac.v5i2.8136 ◽

2017 ◽

Vol 5 (2) ◽

pp. 80

Author(s):

Anuradha Bera ◽

Shatrughan Malav ◽

Bajrang Lal Tiwari ◽

Shyam Govind Vaijapurkar

Keyword(s):

Film Thickness ◽

Gamma Radiation ◽

Thick Films ◽

Radiation Processing ◽

Γ Radiation ◽

Dye Loading ◽

Leucomalachite Green ◽

Colour Development ◽

Green Coloration ◽

Potential Use

Colourless polystyrene-leucomalachite green (PS-LMG) thick films containing a suitable chloroalkane were prepared by a fast and facile casting method, and were investigated for their radio chromic response behavior under the influence of 1.25 MeV γ-radiation. Their gamma response was studied in the 0.05 kGy to 10 kGy range to evaluate their suitability for potential use as the dosimeter in the radiation processing industries. The films were found to undergo a visibly distinct green coloration in the studied range, with the colour intensity increasing with an increase in the total dose. The radiochromic response of these films when investigated as a function of film thickness showed that the colour development as well as the linearity of the response was markedly affected by the thickness of the films. The effect of dye loading and the chloroalkane concentration on the radiochromic response of these films were also investigated. Depending upon the film thickness and reactant concentrations, the films were found to be capable of visually detecting gamma radiation doses as low as few tens of grays.

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