Structural, optical and electrical properties of Ag doped PbS thin films: role of Ag concentration

Touati, Baligh; Gassoumi, Abdelaziz; Kamoun‐Turki, Najoua

doi:10.1007/s10854-017-7785-6

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…Those crystal nuclei may agglomerate, resulting in the formation of small, dense particles that increase the continuity and uniformity of the film surface. Moreover, the size of the nanospheres decreased with increased Cr doping, and was consistent with the average particle size of the particles estimated by the XRD data and agreed with a previous report on Ag incorporation into PbS films [4]. In addition, the surface morphology of all nanofilms was smooth, dense, and free of defects or cracks.…”

Section: Structural Propertiessupporting

confidence: 91%

“…This behavior can be attributed to an increased in light scattering loss. Moreover, after Cr inclusion into the film, the absorption edge was blue-shifted from near-infrared toward the visible region; this was consistent with previous reports [4,24]. Then, the absorption data of light was processed using the Tock formula [25] as follows:…”

Section: Optical Researchsupporting

confidence: 85%

“…As an IV-VI semiconductor elemental compound, PbS has a small direct band gap (~0.4 eV at room temperature) [1,2] and a relatively large excitation Bohr radius (approximately 18 nm). Its optical band gap is adjustable [3] and combines with high temperature and oxidation resistance [1,4]. To date, PbS thin films are widely used in the field of optical and electronic devices due to their high response rates [1,5], ease of preparation, and stable operation at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cr Doping Concentration on the Structural, Optical, and Electrical Properties of Lead Sulfide (PbS) Nanofilms

Huo

Wang

2019

Coatings

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In this paper, pristine and Cr-doped lead sulfide (PbS) nanofilms were prepared by chemical and deposition methods. From X-ray diffraction (XRD) analysis, all nanofilm samples possessed good crystallinity with a preferential orientation of the (200) crystal plane. As the Cr doping concentration increased, the nanofilm grain size decreased from 71.5 to 18.9 nm. The SEM results revealed that the variation in Cr concentration led to different grain shapes, and the grain size became smaller with the increasing doping concentrations. Optical studies showed that the optical band gap of PbS films increased from 1.21 to 1.60 eV after Cr doping due to the quantum confinement effect; the 2% Cr-doped PbS nanofilm, with an Eg of 1.49 eV, matched the ideal band-gap value. The electrical characterization showed that, for a 2% Cr doping concentration, the Hall mobility and volume carrier concentration of the nanofilm reached the maximum values of 59.6 cm2∙V−1 s−1 and 20.7 × 1016 cm−3 respectively. The 2 at.% Cr-doped PbS nanofilms exhibited the best optical and electrical properties, suitable for solar cell applications.

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Section: Structural Propertiessupporting

confidence: 91%

Section: Optical Researchsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Effect of Cr Doping Concentration on the Structural, Optical, and Electrical Properties of Lead Sulfide (PbS) Nanofilms

Huo

Wang

2019

Coatings

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“…The obtained intensity of Ag-doped film is slightly increased up to 6% Ag, which signifies that the Ag + ions are incorporated into the regular lattice site of Pb 2+ ions. The same nature of the increase in intensity was also observed by Touati et al 28 Further, the decrease in intensity was perceived for the increase of Ag doping at 8%. This peak reduction may possibly occurs by the slight variation in the Ag (1.26 Å) ionic radius with Pb (1.20 Å), which leads to some lattice distortion or crystal imperfections because the Ag + ions can disturb the crystalline improvement of host Pb 2+ .…”

Section: Experiments and Characterizationsupporting

confidence: 81%

Ag‐doped PbS thin films by nebulizer spray pyrolysis for solar cells

Rosario¹,

Kulandaisamy²,

Kumar

et al. 2020

Int J Energy Res

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Summary Silver (Ag)‐doped PbS (PbS:Ag) thin films of 616 to 745 nm in thickness were prepared on glass substrates via cost‐effective nebulizer spray method by adding different Ag levels from 2% to 8% at 200°C. For solar cell applications, the effect of Ag doping concentration on structural, morphological, optical, photoluminescence, and electrical chattels of PbS thin film has been studied. X‐ray diffraction pattern confirmed the polycrystalline behavior of the prepared PbS:Ag films with cubic crystalline nature. The crystalline size and texture coefficient were increased by increasing Ag doping concentration. From the morphological studies by scanning electron microscope (SEM) and atomic force microscope (AFM), the grain size of the films and surface roughness values were increased for the increase in Ag doping concentration. EDS spectra confirmed the existence of Ag, Pb, and S elements in the select 6% Ag‐doped PbS film. Peaks related to silver oxide started to emerge at 6% of Ag doping level. The optical direct band gap value was reduced from 1.51 to 1.17 eV for Ag doping from 2% to 6% and thereby slightly increased as 1.79 eV for 8% Ag doping level. For all PbS:Ag films, the photoluminescence spectrum emitted a strong near band edge (NBE) emission at approximately 580 nm, meaning better optical quality. Hall effect measurements evidenced that Ag doping provides enhancement on the characteristics of mobility, carrier concentration, and resistivity with p‐type conducting nature. The observed high carrier concentration and low resistivity values were 4.32 × 1014 cm−3 and 80 Ωcm, for 6% Ag‐doped PbS film. The FTO/CdS/PbS:Ag heterostructure solar cell was formed from 6% Ag‐doped film.

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“…22 Touati et al have detected a blue shi of the bandgap due to the quantum connement effect for (0-8%) Ag-doped PbS thin lms. 23 A systematic decrease in the crystallite size with increasing Hg concentration in the PbS thin lms was reported by Palomino-Merino et al 24 Also, Portillo et al showed that wide bandgap could be obtained for PbS nanocrystals doped in situ simultaneously with Er-Cd-Bi. 25 In addition, the optical absorption of Mn, Cd and co-doped PbS nanocrystals have been investigated by Saravanan et al 26 Most of the previous work focused on enhancing the PEC properties by deposited PbS nanoparticles on different photoelectrodes such as ZnO, TiO 2 , and CuO-Fe 2 O 3 .…”

Section: Introductionmentioning

confidence: 79%

The structure and photoelectrochemical activity of Cr-doped PbS thin films grown by chemical bath deposition

2020

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Structural, optical and electrical properties of Ag doped PbS thin films: role of Ag concentration

Cited by 14 publications

References 34 publications

Effect of Cr Doping Concentration on the Structural, Optical, and Electrical Properties of Lead Sulfide (PbS) Nanofilms

Effect of Cr Doping Concentration on the Structural, Optical, and Electrical Properties of Lead Sulfide (PbS) Nanofilms

Ag‐doped PbS thin films by nebulizer spray pyrolysis for solar cells

The structure and photoelectrochemical activity of Cr-doped PbS thin films grown by chemical bath deposition

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