ELECTRODEPOSITION AND CHARACTERIZATION OF ZnO THIN FILMS FOR SOLAR CELL (original) (raw)
Related papers
2012
A low temperature aqueous chemical route is employed for the synthesis of zinc oxide (ZnO) nanorod arrays onto the soda lime and fluorinedoped tin oxide (FTO) coated glass substrates at various deposition times. Synthesis/farming of ZnO nanorod arrays (ZNRs) consists of the three-step as-ZnO seed forming, ZnO seed sowing followed by ZnO nanorod arrays growing. The length and diameter of ZnO nanorods increased with the reaction time prolonging. The physical, chemical and morphological properties were analyzed by means of X-ray diffraction (XRD), UV-visible spectroscopy (UV-vis), photoluminescence (PL), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM) respectively. The XRD pattern revealed wurtzite crystal structures of ZNRs, preferentially orienting in the (002) direction. SEM micrographs show that the ZnO nanorods grew up perpendicular to the substrate and their length increases with increase in deposition time. Finally, the photoelectrochemical (PEC) performance of ZNRs thin films were studied. The junction quality factor upon illumination (n l ), series and shunt resistance (R s and R sh ), flat-band-potential (V FB ), fill factor (FF) and efficiency (Z) have been estimated.
ZnO nanostructures for photovoltaic cells
physica status solidi (b), 2010
In this work the use of different ZnO nanostructures has been studied to assess the effect of morphology and surface modification on the performance of photovoltaic devices. ZnO nanostructures (nanoparticles, nanowires and nanofibres) have been produced by different techniques, and surface modified with pyrene-1-carboxylic acid (PCA). The materials prepared were characterized by XRD, UV-Visible spectroscopy, TEM and SEM. The photovoltaic devices have been prepared in two different configurations: glass/ITO/ PEDOT:PSS/photoactive layer/Al and glass/ITO/ZnO/photoactive layer/PEDOT:PSS/Ag paste using spin coating and were characterized by current-voltage characteristics measurement under simulated standard illumination conditions. Whilst ZnO nanoparticles yielded the best results, surface modification with PCA resulted in solar cells with higher short circuit current densities but lower open circuit voltage pointing to a better carrier collection but also higher recombination. Figure 1 (a) TEM image of ZnO nanoparticles, (b) SEM image of ZnO nanowires, (c) SEM image of ZnO fibres.
Zinc oxide nano thin film for solar cell device applications
2022
Background: Zinc Oxide (ZnO) thin film was deposited using simple low cost spray pyrolysis technique. The deposited film was characterized by X-ray diffractometer (XRD), Scanning Electron Microscope (SEM) and UV-Visible spectroscopy. XRD Spectra revealed that ZnO film represents polycrystalline wurzite crystal structure. Full Width at Half Maximum (FWHM) was estimated using Lorentz Fit of XRD data. The crystallite size calculated was to be 26.31 nm. The SEM image of ZnO thin film shows whole surface was uniformly coated with spherical ZnO grains of average size 111.55 nm. Purity of the deposited sample was investigated by using Energy Dispersive X-ray Analysis (EDX). The deposited ZnO film shows 78% transmittance. The optical band gap estimated by Tauc plot was 3.76eV. Address for Correspondence: Dr Sarika Jadhav, Department Of Physics Sant Tukaram College Of Arts And Science, Parbhani, INDIA. Email:sarika.jadhav125@gmail.com Received Date: 10/08/2021 Revised Date: 29/09/2021 Accept...
Electrochimica Acta, 2013
In this work we have studied the influence of experimental conditions (temperature, presence of oxygen in the bath solution and deposition time) on morphology, optical properties and composition of the seed layers electrochemically deposited on indium tin oxide (ITO) electrodes in aqueous solutions of Zn(NO 3) 2 and Zn(CH 3 COO) 2. The scanning electron microscope images of the samples prepared at different deposition charge densities were correlated with the transmittance spectra and SEM pictures of ZnO nanorods grown on the seeded substrates to determine the optimum conditions of preparation of highly oriented ZnO nanorods arrays for solar cells applications. We have also presented a method of deposition of Zn nanosheets, uniformly distributed and vertically oriented to the substrate and discussed the influence of oxygen on the form of Zn nanostructures.
Materials Letters, 2015
The synthesis of ZnO nanorods on transparent conducting oxides, Al doped ZnO seed layer on glass substrate (AZO) and indium tin oxide substrate (ITO) by using zinc nitrate hexahydrate (Zn (NO 3) 2 •6H 2 O) and Hexamethylenetetramine (HMT, (CH 2)6N 4 as raw materials is presented. The ZnO seed layer was fabricated by depositing an Al-doped ZnO thin film on glass substrate by sputtering. The effect of seeding on (AZO) and (ITO) substrate by using the wet chemical route growth of ZnO nanorods was investigated. The synthesized nanostructures of ZnO were characterized by X-ray diffraction (XRD), UV-Vis absorption spectroscopy, scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results indicated that all the nanostructures of ZnO were preferentially grown as nanorods along [0002] direction (c-axis) of the hexagonal wurtzite structure and the nanorods which were grown on annealed seeded substrate are well shaped hexagonal faceted than those formed on non seeded substrate. However we have observed that when we were increasing the aluminum doping on the seed layer the ZnO growth was as nanoplatelets.
P A Electrochemically deposited nanostructured ZnO films for solar cells applications
2012
The structural and optical properties of nanostructured ZnO layers grown on SnO 2 :F covered glass substrate by the method of electrochemical deposition are studied. The layers are deposited from aqueous solution containing ZnCl 2 , KCl, pH 4.00 and additional supplement of ZnO powder suspension in the condition of flowing air. The influence of the deposition parameters on the structural properties of the obtained ZnO layers are studied by SEM, AFM and XRD. The SEM micrographs and AFM pictures show that the ZnO films consist of nanograins. XRD spectra demonstrate preferential (002) orientation of the nanograins with average size 64-69 nm. A correlation between the diffuse reflection, haze ratio spectra and the average surface roughness is observed.
Preparation and Photoelectrochemical Performance Research of ZnO Nanorod Arrays
2011
Abstract: ZnO nanorod arrays were prepared by chemical bath deposition (CBD) method on fluorine doped tin oxide (FTO) conducting glass substrate. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were used to characterize the ZnO nanorod arrays. As-prepared ZnO nanorods are single-crystalline hexagonal wurtzite structure. The individual ZnO nanorod is about 50nm diametric and 1micro long. The nanorod arrays are dense oriented and uniform.
ELECTROCHEMICALLY DEPOSITED NANOSTRUCTURED ZnO FILMS FOR SOLAR CELLS APPLICATIONS
The structural and optical properties of nanostructured ZnO layers grown on SnO 2 :F covered glass substrate by the method of electrochemical deposition are studied. The layers are deposited from aqueous solution containing ZnCl 2 , KCl, pH 4.00 and additional supplement of ZnO powder suspension in the condition of flowing air. The influence of the deposition parameters on the structural properties of the obtained ZnO layers are studied by SEM, AFM and XRD. The SEM micrographs and AFM pictures show that the ZnO films consist of nanograins. XRD spectra demonstrate preferential (002) orientation of the nanograins with average size 64-69 nm. A correlation between the diffuse reflection, haze ratio spectra and the average surface roughness is observed.
Low temperature simple aqueous phase chemical synthesis and characterization of ZnO thin films
Zinc oxide (ZnO) nanorods were successfully deposited on the glass and fluorine doped tin oxide coated glass substrate in an aqueous alkaline medium using zinc acetate, ethylene diamine, hexamethylene tetraamine and ethanol by simple chemical reflux method at low temperature. An Optical, structural, morphological compositional and photoelectrochemical (PEC) properties of ZnO thin films were investigated. Optical absorption study of the sample shows band gap value 3.24 eV. The X-ray diffraction (XRD) pattern indicates that the deposited material is nanocrystalline and nanorods formation takes place along (002) plane having hexagonal wurtzite crystal structure. The scanning electron microscopy (SEM) images demonstrate existence of hexagonal nanorods with average50nm lengths and 10 nm diamete.The X-ray photoelectron spectroscopy (XPS) study confirms well composed thin film formation. The PEC study revel that material exhibit photo conversion efficiency 1.84 % for solar cell application.
Optical and Structural Properties of ZnO Thin Films for Solar Cell Applications
Advanced Science Letters, 2013
ZnO Thin films are deposited on glass substrate by simple sol-gel process. The intended application for such structures is Photovoltaics, especially organic solar cells. The effect of precursor concentration on the surface morphology, optical properties and structure of the ZnO thin films are investigated. XRD analysis confirms the growth of ZnO with wurtzite (hexagonal) structure. The refractive index, extinction coefficient and transmission of the films are measured with spectroscopic Ellipsometry. The results show high dependence of optical band gap to synthesis conditions. The direct optical band gap of the films is in the range of 3.52-3.66 eV. The SEM results show variation in grain size in the range of 30 to 150 nm for nano particles obtained from sols with different precursor concentrations. The topography and surface roughness as determined by using atomic force microscopy have values in the range 1.12 to 3.35 nm.