Structural, morphological, optical and electrical properties of spray deposited ternary CdAgS thin films towards optoelectronic applications

Narasimman, V.; Nagarethinam, V. S.; Usharani, K.; Balu, A. R.

doi:10.1080/14328917.2016.1264857

Cited by 16 publications

(12 citation statements)

References 20 publications

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“…These signals are emitted with very small intensity, two orders of magnitude less than visible emissions, because most excited electrons decay rapidly to CB due to the phonons generation [68]. The discrete emissions have been also observed by Narasimman et al in Zn-doped CdS, but the origin was not identified [69]. Notice in Fig.…”

Section: (Right)mentioning

confidence: 74%

Optical properties of CdS nanocrystalline thin films in the abrupt phase transition from zinc blende to wurtzite

Torres‐Castanedo

Márquez‐Marín²,

Castanedo‐Pérez³

et al. 2020

J Mater Sci: Mater Electron

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A set of cadmium sulfide (CdS) thin films was grown on glass substrates by the chemical bath deposition technique at different bath temperatures (T b ). A microwave oven was used to heat the precursor aqueous solution employed to prepare the films in the 60-97 °C interval. The average crystallite size of the CdS films lies in the 7-20 nm range, calculated from X-ray diffraction data. The diffraction patterns reveal that the crystalline structure of CdS nanoparticles is cubic zinc blende (ZB) for 60 ≤ T b ≤ 93 °C, hexagonal wurtzite (WZ) for 95 ≤ T b ≤ 97 °C, and ZB-WZ mix of phases for the critical temperature T b ≅ 94 °C (T bc ). The mixture of both phases is supported by Transmission Electron Microscopy. The CdS films show preferred orientation along ( 111) and ( 002) directions for ZB and WZ, respectively. The optical properties reveal significant changes at T bc , namely, the energy band gap, photoluminescence emission, and refractive index. The photoluminescence results show an additional band at the critical phase transition temperature due to the presence of a high-density Cd interstitial/vacancies, produced by the mix of phases. Furthermore, high-energy transitions above the conduction band also exhibit splitting due to the phase transition.

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Section: (Right)mentioning

confidence: 74%

Optical properties of CdS nanocrystalline thin films in the abrupt phase transition from zinc blende to wurtzite

Torres‐Castanedo

Márquez‐Marín²,

Castanedo‐Pérez³

et al. 2020

J Mater Sci: Mater Electron

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“…The variation of crystallite size with different metals doping into CdS may attribute to difference in lat-tice parameter values and ionic radius of Ag, Fe and Zn. Incorporation of different metal ions into the CdS lattice can cause the lattice volume of Cd ions since the ionic radius of Cd 2+ is different from the ionic radius of Ag, Fe and Zn [42].…”

Section: = Kλ /β Cosθmentioning

confidence: 99%

Metals Doped CdS Quantum Dots: Structural, Optical and Photocatalytic Properties under Visible Light Irradiation

Abdullah¹,

Majeed²,

Ali³

2020

Int J Metall Met Phys

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Cadmium sulphide quantum dots (CdS-QDs) were obtained by a precipitation method. Studies on the structural, optical and photocatalytic properties of undoped and metals (M = Fe, Ag, Zn) doped CdS were investigated. The structural properties of the metals composite CdS were analyzed using X-ray diffraction (XRD) and Infrared (IR) techniques. Optical properties of the composite materials were characterized by absorption and photoluminescence techniques. XRD pattern reveals the undoped and metals doped QDs have highly crystalline in nature with cubic phases. High transmission electron microscopy (TEM) shows the spherical shape of particles with approximately 3-4 nm in sizes. The crystallite sizes of CdS are increased with doping of metals but slightly different the sizes of XRD and TEM images. The band gap values of CdS, Fe:CdS, Ag:CdS, and Zn:CdS calculated by Tauc plot are predicted as 3.64, 3.50 eV, 3.43 and 3.35 eV respectively. Upon doping metals, shift in band gap of QDs toward the longer wavelength with the increases of crystallite sizes is observed and depends on type of metals. The emission peak of QDs is appeared at 521 nm along with a shoulder at 430 nm which confirms of cadmium vacancies in the lattice. The emission intensity of QDs is decreased when metals are included. The emission peaks of metals doped QDs are gradually decreased over the increasing irradiation time and influenced by the nature of metal. The photo-catalytic activity and efficiency degradation are dependent of metals which may due to different crystal quality in Ag, Fe and Zn into CdS QDs composite. Present results suggest that Zn:CdS composite enhanced with superior photo-degradation efficiency and photo-catalytic activity under the sunlight.

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“…Photoluminescence (PL) is the process in which an electron excited by monochromatic photon beam of certain energy undergoes radiative recombination either at valence band (band edge luminescence) or at traps/surface state (normally red shifted luminescence) within the forbidden gap. Photoluminescence originates from the recombination of surface state [40,41]. PL emission measurements of CdS and CdS:Mn (5%, 10% & 15%) nanoparticles carried out at room temperature using Xe lamp as the light source are displayed in figure5.…”

Section: E Photoluminescence Studiesmentioning

confidence: 99%

Analysis of the Influence of Mn2+ Incorporation on Structural and Spectroscopic Features of CdS Nanoparticles

Ramteke¹,

Lanje²,

Pimpalshende³

2018

IJSRPAS

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Nanocrystalline bare and Mn 2+ doped CdS with different concentration have been synthesized by employing a simple chemical co-precipitation method. In order to gain crystalline nanoparticles of CdS and CdS:Mn; cadmium acetate, sodium sulphide and manganese (II) acetate have been utilised as the supply of cadmium, sulphur and manganese (Mn) respectively. DMF has been used as the stabilizing agent and also the reaction catalyst. The structural analysis of the prepared samples by X-ray diffraction (XRD) exhibits the Mn 2+ dopant atoms are incorporated at the Cd sites and authenticate the cubic phase, without affecting the original cubic phase of CdS and the particle size estimated to be around 3 to 5 nm. The scanning electron microscopy has been employed to study the morphology of the prepared samples. UV-Vis spectral analysis validates the significant blue shift in the optical band gap of CdS nanoparticles on account of the quantum confinement impact. The optical band gap of the samples is found to be decreasing with the accumulation of dopant content. The presence of functional groups in the prepared samples has been detected by making use of the FTIR technique. The PL emission spectrum shows two major emission peaks one in the blue region and second in the red region along with one broad lower intense peak in the IR region.

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Structural, morphological, optical and electrical properties of spray deposited ternary CdAgS thin films towards optoelectronic applications

Cited by 16 publications

References 20 publications

Optical properties of CdS nanocrystalline thin films in the abrupt phase transition from zinc blende to wurtzite

Optical properties of CdS nanocrystalline thin films in the abrupt phase transition from zinc blende to wurtzite

Metals Doped CdS Quantum Dots: Structural, Optical and Photocatalytic Properties under Visible Light Irradiation

Analysis of the Influence of Mn2+ Incorporation on Structural and Spectroscopic Features of CdS Nanoparticles

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