Characterisation of chemical bath deposited CdS thin films on different substrates using electrolyte contacts

Aqueous electrolyte contacts have been used to characterize CdS thin films grown using chemical bath deposition (CBD) on 4 different fluorine-doped tin oxide (FTO) coated conducting glass substrates (identified by the supplier Pilkington Group Limited as TEC-15, TEC-7, NSG low-E, and NSG Solar). The...

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Veröffentlicht in:Thin solid films 2011-08, Vol.519 (21), p.7583-7586
Hauptverfasser: Samantilleke, A.P., Cerqueira, M.F., Heavens, S., Warren, P., Dharmadasa, I.M., Muftah, G.E.A., Silva, C.J.R., Marí, B.
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container_end_page 7586
container_issue 21
container_start_page 7583
container_title Thin solid films
container_volume 519
creator Samantilleke, A.P.
Cerqueira, M.F.
Heavens, S.
Warren, P.
Dharmadasa, I.M.
Muftah, G.E.A.
Silva, C.J.R.
Marí, B.
description Aqueous electrolyte contacts have been used to characterize CdS thin films grown using chemical bath deposition (CBD) on 4 different fluorine-doped tin oxide (FTO) coated conducting glass substrates (identified by the supplier Pilkington Group Limited as TEC-15, TEC-7, NSG low-E, and NSG Solar). The porosity of CdS layers prepared on different substrates was evaluated by voltammetry using the oxidation of hexacyanoferrate (II) to probe residual electrochemical activity arising from the underlying conducting substrate. Using a simple model, it can be concluded that thin films deposited on NSG substrates at 85 °C are probably nanoporous with a porosity of up to ~ 20% of the coverage of the CdS surface. The porosity appears to depend on the nature of the substrate rather than the physical parameters of the deposition. In the case of non-porous films deposited on TEC substrates, analysis of the impedance gave values of the space charge capacitance from which the doping density and flat band potential were derived. The doping densities for CdS were found to be in the order of 10 17 cm −3–10 20 cm −3 depending on the substrate. The transmission spectra, recorded in the UV–visible range, reveal a relatively high transmission coefficient in the obtained films. The transmittance data further indicate that the optical band gap is closely related to the deposition conditions. Micro-Raman analysis showed structural similarity and differences between porous and non-porous thin films.
doi_str_mv 10.1016/j.tsf.2010.12.218
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The transmittance data further indicate that the optical band gap is closely related to the deposition conditions. Micro-Raman analysis showed structural similarity and differences between porous and non-porous thin films.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.tsf.2010.12.218</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record>
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subjects Cadmium sulfides
CdS
Chemical bath deposition
Chemistry
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conduction
Cross-disciplinary physics: materials science
rheology
Density
Deposition
Doping
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
Liquid phase epitaxy
deposition from liquid phases (melts, solutions, and surface layers on liquids)
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Nanoporous
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of specific thin films
Other topics in nanoscale materials and structures
Physics
Porosity
Thin films
title Characterisation of chemical bath deposited CdS thin films on different substrates using electrolyte contacts
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