Electrochemical Deposition of CdS Thin Films on Mo and Al Substrates

Abstract

The formation of cadmium sulfide thin films by cathodic deposition of Cd2+ ions from a solution containing sulfur on different substrates (platinum, molybdenum, aluminum) is described along with the influence of the substrate on the formation and morphology. By evaporating a Cu2S layer on the normalCdS films deposited on aluminum, a heterojunction which exhibits photovoltaic effect is formed.

Electrodeposition of Semiconductors

“…Cadmium sulfide has been formed from the anodization of the metal in alkaline sulfide solution [100] and in buffered sulfide solution [101,102]. It has been deposited cathodically from a solution containing cadmium and thiosulfate ions [103,104]. Lowering the pH by the addition of dilute H 2 SO 4 was shown to cause the decomposition of the S 2 O 2À 3 to form colloidal sulfur and improve the deposition by elimination of the anodic stripping peak in the cyclic voltammogram compared to that observed with thiosulfate at its natural pH of 6.7.…”

Electrodeposition of Zn(O,S) (zinc oxysulfide) thin films: Exploiting its thermodynamic and kinetic processes with incorporation of tartaric acid

“…The electrodeposition of Zn(O,S) is actually a combined process of depositing ZnS and ZnO. The reaction routes for anions were different, as ZnS may require the disproportionate reaction of thiosulfate at low pH [29,30] or need the assistance of hydrogen to reduce thiosulfate [31] , and ZnO would need OH − as the oxygen source. However the both need to react with zinc cation to form deposition products.…”

Electrochemical Studies on the Cathodic Electrodeposition of n-type semiconductor CdS thin film from Thiosulfate Acidic Aqueous Solution

“…Electrochemical deposition is an attractive method for preparation of thin films in commercial quantities because it uses relatively cheap equipment, enables the deposition in large area and easy control of growth parameters through applied potential, current, pH and temperature of the bath. Many works have been reported for studying the mechanism of an electrochemical deposition of CdS from aqueous [1][2][3][4][5][6].…”

“…Cadmium sulfide has been formed from the anodization of the metal in alkaline sulfide solution [7] and in buffered sulfide solution [8,9]. It has been deposited cathodically from a solution containing cadmium and thiosulfate ions [1,10]. CdS has also been deposited on ITO-coated glass potentiostatically [11].…”