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Barote M.A.,Azad college | Yadav A.A.,Thin Film Research Laboratory | Masumdar E.U.,Thin Film Research Laboratory
Thin Solid Films | Year: 2012

CdzPbyS thin films have been deposited on glass substrates using inexpensive chemical bath deposition technique. The aqueous solution containing precursors of Cd2 + and Pb2 + has been used to obtain good quality deposits at optimized preparative parameters. The thin film samples have been characterized through optical absorption, electrical conductivity and thermoelectric power measurement techniques. From optical studies, the absorption coefficient 'α,' is found to be of the order of 104 cm- 1. The optical absorption studies revealed direct band to band transition. The band gap energy is found to vary nonlinearly from 2.47 eV (CdS) to 0.49 eV (PbS) as the composition parameter 'x' was increased from 0 to 1. The electrical characterization revealed increased conductivity (σ) with the increased composition parameter up to x = 0.175. The electrical conductivity measurements indicate two types of conduction mechanism, namely grain boundary scattering limited and variable range hopping conductions. The activation energies of the films of different compositions were determined at low and high temperature regions. The activation energies were observed to be in the range of 0.168-0.240 eV and 0.514-0.711 eV respectively. Thermoelectric power measurements highlighted n-type behavior of the as-grown thin film samples. © 2012 Elsevier B.V. Source


Barote M.A.,Azad college | Deshmukh L.P.,University of Solapur | Masumdar E.U.,Thin Film Research Laboratory
Ceramics International | Year: 2013

This paper discusses chemical synthesis of Cd1-xPbxS (0≤x≤1) thin film layers and their photo-electrochemical properties with special reference to PEC parameters. Previously optimized conditions were used for the deposition. The electrode/electrolyte interfaces were then formed between the Cd1-xPbxS thin film layers and a sulphide/polysulphide (1 M) redox couple and investigated through the various photo-electrochemical (PEC) properties to assess suitability to convert solar energy into electrical energy. Increase in short circuit current (I sc) and open circuit voltage (Voc) was observed with increased composition and attain maximum at x=0.175. Power conversion efficiency and fill factor were found to be 0.163% and 46.2% respectively for the composition parameter x=0.175. © 2012 Elsevier Ltd and Techna Group S.r.l. Source


Barote M.A.,Azad college | Yadav A.A.,Thin Film Research Laboratory | Masumdar E.U.,Thin Film Research Laboratory
Chalcogenide Letters | Year: 2011

A Simple and cost effective chemical bath deposition process has been employed for the preparation of Cd1-xPbxS (x = 0.00, 0.20, 0.40, 0.60, 0.80, 1.00) thin films. Cadmium sulphate, lead sulphate and thiourea were used as the basic source materials. The effect of various preparative parameters such as bath composition, pH of the reaction solution, deposition temperature and time, speed of the substrate rotation and the complexing agent on growth process is studied and these parameters are optimized for good quality films. The colour of the 'as-deposited' thin films has changed from orange yellow to black as the composition parameter x changed from 0 to 1. The film thickness is found to be increased with increasing the composition parameter x from 0 to 1. The X-ray diffraction (XRD) studies revealed that films are polycrystalline in nature and exhibit both cubic and hexagonal structure for pure CdS but only cubic phases for pure PbS film. The energy dispersive analysis by X-rays (EDAX) studies revealed that films are cadmium rich. The energy band gap is decreased from 2.47 eV to 0.49 eV as composition parameter 'x' is increased from 0 to 1. Source


Barote M.A.,Azad Mahavidyalaya | Yadav A.A.,Thin Film Research Laboratory | Suryawanshi R.V.,Azad Mahavidyalaya | Masumdar E.U.,Thin Film Research Laboratory
Journal of Ovonic Research | Year: 2011

The thin films of Cd 1-xPb xS (0 ≤ x ≤ 1) have been deposited onto clean glass substrates by economical bath deposition technique. The deposition parameters were optimized to obtain good quality thin films. The absorption spectra of these films have been recorded using spectrophotometer. The energy band gap (E g) and absorption coefficient (α) has been determined using these spectra. It is found that the band gap decreases with increase in Pb concentration. It is observed that energy band gap is varied from 2.47 eV (CdS) to 0.49 eV (PbS) as composition parameter 'x' increased from 0 to 1. The nature of the band gap has also determined in this paper. Source


Survase S.,Thin Film Research Laboratory | Thakurdesai M.,Thin Film Research Laboratory | Rao A.G.,U.S. Navy
Chalcogenide Letters | Year: 2015

In the present investigation, nanocrystalline Cadmium Telluride (CdTe) thin films are deposited on glass substrates by thermal evaporation method. The films are deposited at various substrate temperatures of 573 K, 623 K, 673 K and 723 K. Structural characterization is carried out using X-ray diffraction (XRD) technique. XRD studies reveal nanocrystalline nature of the films. Scanning Electron Microscopy (SEM) is employed to investigate the surface morphology. SEM studies indicate that the nanograin formation begins at 573 K. However, increase in substrate temperature leads to grain agglomeration. The optical characterization is carried out using UV-Vis spectrophotometer. It is observed that the bandgap value is dependent on substrate temperature. All the experimental results indicate that the substrate temperature plays a major role in nanocrystallisation of CdTe thin films. This paper aims at studying the role of substrate temperature in CdTe nanopahse formation. © 2015, National Institute R and D of Materials Physics. All rights reserved. Source

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