Showing papers on "Chemical bath deposition published in 1986"

Structural characterization and optical properties of CdS films grown by electrodeposition

Abstract: Cadmium sulphide is a semiconductor material of great interest because it has the potential to play an important part in practical solar energy conversion devices such as Cu2S/CdS heterojunction cells [1, 2] and as electrodes in photoelectrochemical cells [3]. CdS shows two polymorphic cases; one is hexagonal (wurtzite) and the other cubic (zincblende). For its application in photovoltaic cells it is necessary that the growth phase should be the hexagonal one. A variety of techniques for the formation of this material have been described: evaporation [4], sputtering, spray, chemical bath deposition [5] and electrodeposition in aqueous and non-aqueous media [6, 7]. We 'have studied the electrochemical deposition of CdS thin films on different substrates in aqueous solutions [8]. In this work, the structural, optical and morphology of CdS films on aluminium substrates obtained by this method has been studied. The CdS films were grown by electrodeposition in a solution containing 2 x 10 3M C d S O 4 , 0.1M Na2S203 adjusting the pH to 2.3 with H2SO4. Under these conditions, the SzO32is decomposed to colloidal sulphur, which is reduced to sulphide ions which, together with Cd 2 present in the interface, form a CdS film on the electrode. Fig. 1 shows the voltammogram corresponding to the formation of CdS on an aluminium electrode at pH = 2.3, the cathodic current appearing between 800 and 1000 mV with respect to SCE (standard calomel electrode). When 1 0 0 0 mV with respect to SCE was applied for a sufficiently long time, the electrode became covered with a yellow uniform translucent rather thick film. For shorter electrolysis times, thin nonadherent CdS films were formed. Therefore, long electrolysis times were used (6 h).

Formation of Cu2S thin films by an electrochemical procedure

Abstract: The formation of copper sulphide thin films on copper substrates has been studied. The method of preparation is based on a chemical bath deposition process during which a cathodic potential is applied to the substrate. The composition, optical and electrical characteristics have been measured and their variation with the applied potential is analysed. The film obtained when the appropriate potential value was applied to the substrate was confirmed by transmission electron diffraction (TED) studies to be chalcocite.

Preparation of thin film electrodes for electrochemical solar cells - chemical bath deposition

Abstract: Many methods are available for the preparation of thin films of semiconductors used as photoelectrodes in photoelectrochemical cells. In this article, Chemical Bath Deposition (CBD) is discussed. The emphasis is on thin films particularly for use in solar energy conversion application through the electrochemical route.