Structural and Optical Characterization of Chemically Deposited PbS Thin Films (original) (raw)
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Structural and optical properties of PbS thin films deposited by chemical bath deposition
Materials Chemistry and Physics, 2006
In the current paper lead sulphide (PbS) thin films have been deposited on glass slide substrates via a simple and easily controlled method, proceeding large area films, using the chemical bath deposition technique. The reactive substances used to obtained the PbS layers were (Pb(NO 3) 2), (NaOH), (SC(NH 2) 2) and H 2 O for different concentration and dipping times, at constant room temperature. The structure was determined by X-ray diffraction studies. The films are very adherent to the substrate and well crystallized according to the centered cubic structure with the preferential orientation (2 0 0). The surface morphology and crystallite sizes were determined by scanning electron microscope measurements. The optical properties were carried out from spectroscopy measurements of transmission-reflection and ellipsometry. The thickness of these films was controlled by changing the dipping times and the concentrations of the reaction solution. Experiments showed that the growth parameters and thermal treatment influenced the structure, the morphology and the optical properties of PbS films.
Structural and Optical Characterization of Nanocrystalline Pbs Thin Films Synthesized by CBD Method
2013
Nanocrystalline PbS thin films have been deposited on glass substrates by Chemical Bath Deposition (CBD) technique using lead acetate ,KoH, thiourea and T.E.A. The films were btained in a reaction bath at times of (15 ,30 ,45 ,60 and 90)min. Structure and surface morphology of thin films were characterized by X-ray diffraction and scanning electron microscopy (SEM). XRD indicates that the films have cubic structure. The crystallite size of the films were found to vary from (4.9 to 11.3 nm).The band gaps of the nanocrystalline PbS were determined from UV-Vis spectrophotometer and were found to be in the range( 1.72 -2.4 eV).
OPTICAL AND PHOTOCONDUCTIVE PROPERTIES OF CHEMICALLY DEPOSITED NANOCRYSTALLINE PbS THIN FILMS
National Institute of Materials Physics, National Institute of Optoelectronics, 2019
A nanocrystalline thin films of PbS with both thickness (400 and 600)nm have been prepared successfully by chemical bath deposition technique on glass and Si substrates. The structure and morphology of these films were studied by X-ray diffraction and atomic force microscope. It shows that the structure is polycrystalline and the average crystallite size has been measured. The optical parameters of the prepared films as absorption, transmittance, reflectance , optical energy gap, and absorption coefficient were found as affected by varying the thickness. The optical measurement showed that (PbS) films have an allowed direct energy gap (Eg) and that decreases with thickness increasing. The photoconductive measurement gives the positive photoconductive for PbS thin films.
American Based Research Journal, 2018
Lead sulphide (PBS) thin films have been investigated in this present work by using chemical bath deposition (CBD) technique onto glass substrates with different deposition times (20, 40 and 60 min.) at 70 o C (158 o F) exploiting lead nitrate and thiourea as lead and sulphide ions sources. The effect of the deposition time on the optical, morphological and electrical properties of the as-deposited PBS films were studied. The thin films exhibit a strong optical absorption in the ultraviolet (UV) and visible regions but low absorption over the longer wavelength region towards near infrared (NIR) of the electromagnetic spectrum. In contrast, the films transmit very low at the UV and visible regions while NIR region exhibit a good optical transmission. The optical band gap energy of the films decreases with increase in deposition time (D t), ascribing larger particle size. The extinction coefficient (k) of the films increased with deposition time increment which corresponds to greater ...
Lead sulphide (PbS) thin films has attracted interest due to its potential applications in optoelectronics devices, gas sensors, solar cell technology and transparent conducting electrodes. Thin films were grown on glass substrates by pulsed laser deposition (PLD) technique at room temperature and different annealing temperatures (573, 673 and 773) K. The structural measurements for PbS thin film show face-centered-cubic structure. Atomic force microscopy (AFM) was used to examine PbS surface. The films exhibit more homogeneity. The root mean square(r.m.s), surface roughness and average grain size were increased After annealing. The optical properties of PbS thin films are studied as a function to wavelength in region (375-1100) nm. The optical transmittance of PbS thin films shown that the transparency decreases with increase of annealing temperature. The direct energy gap for PbS thin film was decreases with increasing of annealing temperature for all sample due to the growth of the crystallites. The optical constants such as refractive index, extinction coefficient and dielectric constant were also calculated.
Chemistry and Materials Research, 2020
Nanocrystalline PbS thin films were deposited on glass substrates with various deposition times using chemical bath deposition technique. PbS thin films were prepared by using a solution of Lead nitrate and thiourea by using NaOH salt as a complexing agent and ammonia solution as a pH adjuster at 65 0 C. The study was carried out for thickness in the range of (0.16-1.03m). The structural properties were carried out by X-ray diffraction (XRD). The X-ray diffraction patterns reveal that the films exhibit the cubic face centered structure. The crystalline sizes of the films increased with increasing film thickness. The morphological properties were studied by SEM and showed that films were well adherent to the substrate, uniform, small crystal size and covered the entire substrate surface completely. The optical properties of these films have been studied and show that PbS thin films have the values of energy gap varied between (0.88-1.34 eV) with increasing film thickness.
substrates prepared from lead nitrate, ammonia and thiourea solution using Chemical Solution Deposition (CSD) technique. The influence of the deposition ti me on the properties of PbS film is investigated. The other parameters: concentration of the reactants, pH of s olution, and temperature of bath were kept constant for the all depositions. The structure and morphology of prepar ed PbS nanocrystalline were analyzed by atomic force microscope and X-ray diffraction. The AFM images co nfirmed that the surface roughness and cubical grai n size of PbS increased with increasing dipping time. The x-ray results indicated that the obtained materials were cubic nanocrystalline PbSe with an average grain si ze of 60 nm.
Materials Science in Semiconductor Processing, 2014
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/authorsrights Author's personal copy Comparative studies on the structural, morphological, optical, and electrical properties of nanocrystalline PbS thin films grown by chemical bath deposition using two different bath compositions
Synthesis and Characterization of Nanostructured PbS Thin film
In the present work, PbS Nanocrystals with rod shaped structure have been successfully prepared by chemical bath deposition method. The structure was determined by X-ray diffraction studies. The XRD data revealed the formation of cubic phase of PbS with the preferential orientation (2 0 0). The average crystallite size was found to be 7.82 nm. SEM images confirm the formation of nanorods of PbS. The optical properties were studied by recording absorption spectra in the wavelength range of 200-900 nm. The optical bandgap and refractive index was found to be 1.47eV and 2.97, respectively. The electrical resistance was measured using four probe method and it was found to be 0.67MΩ.
Sakarya University Journal of Science, 2018
In the present study, structural and physical properties of the PbS thin films produced using chemical bath deposition method were investigated. Deposition temperature was varied between 25 °C and 50 °C throughout the deposition period. The pH value of electrolyte solution and the deposition time of the films were 10.5 and 25 min, respectively. Characterizations of the PbS thin films were performed using scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. XRD results showed that all PbS thin films had a cubic structure irrespective of deposition temperature. Morphological characterizations of the films indicated that not only the number but also the size of pinholes, formed on the film surfaces, were significantly affected by the deposition temperature. Consequently, the film obtained at 25 C exhibited a surface morphology with less and smaller pinholes, compared to others deposited at higher deposition temperatures.