Photomodulation study in CdS thin films grown by sputtering in a large area

Ximello-Quiebras, J.N.; Mejía‐García, C.; Caballero-Rosas, A.; Hernández-Contreras, H.; Contreras‐Puente, G.; Vidal, Julien; Pascher, H.

doi:10.1016/s0040-6090(03)00233-5

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…However, chemical bath deposition (CBD) has been recognized as the simplest and low cost aqueous technique for preparing films with large area. 11 A recent review of the CBD technique to prepare metal-chalcogenide films was published by Lokhande et al 12 For the last decades CBD technique has received more attention for preparing materials that can be used for different applications in various fields of science such as solar devices and solar cells, 13,18 antireflection coatings, 14 optical filters, 15 electronic devices, 16 photo detectors, 17,19 gas sensors, 20,21 ultraviolet-light sensor, 22 between others. On the other hand, CBD-ZnS semiconductor films have demonstrated to possess interesting properties to be used in different fields of science, such as solar energy conversion.…”

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confidence: 99%

Role of Thiourea in the Kinetic of Growth of the Chemical Bath Deposited ZnS Films

González-Panzo

Várguez

Oliva

2014

J. Electrochem. Soc.

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ZnS films were deposited onto glass substrates by the chemical bath technique at temperatures from 60 to 90 • C. Zinc chloride, potassium hydroxide, ammonium nitrate, and thiourea were used as chemical components. According to the species distribution diagrams, the concentration of the chemical components were maintained constant except for thiourea whose concentration is required to decrease when the bath temperature increases, in order to maintain constant the Zn(O H) 2− 4 /H S − ions concentration. To investigate the kinetic of growth of the ZnS films, their thicknesses were measured as a function of deposition time and bath temperature. The activation energy value estimated for the growing process was E a = 44.9 kJ/mol which is typical for chemical reactions. The mean value of the bandgap energy of the films was 3.67 eV with optical transmittances up to 80% for all bath temperatures. The rms-roughness of the deposited films was observed to decrease when the bath temperature increases. Results of X-ray diffraction analysis on deposited films reveal a cubic (111) 25 report uniformity and smoother morphology properties of CBD-ZnS films for improving solar cells devices. Investigations of some physical properties on the CBD-ZnS films were done by Gümüs et al. 26 and Ben-Nasr et al. 27 Gümüs et al. discuss the polycrystalline structure, electrical resistivity, carrier density, and the bandgap energy of the ZnS films as a function of the deposition parameters (deposition time, bath temperature, and concentrations of the chemical reagents). Ben-Nasr et al, study the effect of the pH and the annealing process on the structural, morphological and electronic properties of the ZnS films. Additionally, the effect of the bath temperature and concentrations of the chemical components on the growth rate, crystalline structure and optical properties of the CBD-ZnS films were investigated by Sundara. 28 An interesting work for understanding the process to control the deposition of ZnS and CdS materials and their chemical differences were reported by O'Brien et al. 29 As can be seen from the literature, CBD-ZnS films have recently received more attention due to their attractive properties that can be controlled during the deposition process under determined experimental conditions. In the CBD technique, deposition of metal-chalcogenide occurs in the surface of substrate immersed in an aqueous solution containing both the metallic and the chalcogenide ions. The well-known deposition mechanism to describe the chemical deposition is via the solubility z E-mail: isjuv.gp@gmail.com product K sp (for ZnS at 25 o C, K sp = 3 × 10 −25 ). 30 Thus, the material deposition occurs when the ionic product of both metallic and chalcogenide ions exceeds the solubility product K sp . They are chemically attached in the aqueous medium and precipitate on the substrate surface producing the metal-chalcogenide film. For the CBD technique is common to require, besides the metallic and non-metallic ions, complementary chemical reagents used as comp...

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confidence: 99%

Role of Thiourea in the Kinetic of Growth of the Chemical Bath Deposited ZnS Films

González-Panzo

Várguez

Oliva

2014

J. Electrochem. Soc.

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“…Below 500nm, the film had a intense absorption with visible light, the transmittance drops to near zero. All films had a apparent absorption edge in 500-600nm, there was a significant decline curve near the absorption edges which showed that the quality of the film was better[9]. In the long wavelength transmittance significantly oscillate with wavelength, this was due to the sputtering proceeds CdS films had a good flatness, interference effects caused by the incident light.…”

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confidence: 94%

Influence of Sputtering Power on the Properties of CdS Thin Films Deposited by Magnetron Sputtering

Wan

Zeng

Gao

et al. 2014

AMR

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CdS films were prepared with different sputtering power by radio frequency magnetron sputtering from CdS slices target. The structural and physical properties of CdS films were studied using X-ray diffraction (XRD), atomic force microscopy (AFM), ultraviolet spectrophotometer and Hall effect measurements. The results of structural analysis showed that CdS films are polycrystalline with a cubic structure having (1 1 1) plane and a hexagonal structure having (0 0 2) plane. AFM micrographs show that the grain size increases with the sputtering power increasing. The optical transmission data indicate that all CdS films have high optical transmittance. In Hall Effect measurements, the electrical resistivity of the deposited films are 3.2x103Ω·cm, 1.5x104Ω and 2.2x104Ω·cm, respectively.

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“…At the same time, nano-particulate CdS thin films have attracted much attention. Those films have been prepared by various approaches, such as vacuum evaporation, 4 sputtering, 5 molecular beam epitaxy, 6 chemical vapor deposition, 7 spray pyrolysis, 8 chemical bath deposition, 9 electrochemical co-deposition 10 and annealing Cd 2+ -dithiol self-assembled films.…”

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Preparation and Characterization of Porous and Composite Nanoparticulate Films of CdS at the Air/Water Interface

Ji¹,

Chen²,

Yang³

et al. 2010

Bulletin of the Korean Chemical Society

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CdS nano-particulate films were prepared at the air/water interface under Langmuir monolayers of arachidic acid (AA) via interfacial reaction between Cd 2+ ions in the subphase and H2S molecules in the gaseous phase. The films were made up of fine CdS nanoparticles with hexagonal Wurtzite crystal structure after reaction. It was revealed that the formation of CdS nano-particulate films depends largely on the experimental conditions. When the films were ripened at room temperature or an increased temperature (60 o C) for one day, numerous holes were appeared due to the dissolution of smaller nanoparticles and the growth of bigger nanoparticles with an improved crystallinity. When the films were ripened further, CdS rodlike nanoparticles with cubic zinc blende crystal structure appeared due to the re-nucleation and growth of CdS nanoparticles at the stacking faults and defect structures of the hexagonal CdS grains. These structures were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and X-ray diffraction (XRD). These results declare that CdS semiconductor nanoparticles formed at the air/water interface change their morphologies and crystal structures during the ripening process due to dissolution and recrystallization of the particles.

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Photomodulation study in CdS thin films grown by sputtering in a large area

Cited by 5 publications

References 4 publications

Role of Thiourea in the Kinetic of Growth of the Chemical Bath Deposited ZnS Films

Role of Thiourea in the Kinetic of Growth of the Chemical Bath Deposited ZnS Films

Influence of Sputtering Power on the Properties of CdS Thin Films Deposited by Magnetron Sputtering

Preparation and Characterization of Porous and Composite Nanoparticulate Films of CdS at the Air/Water Interface

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