PREPARATION OF CuInSe2 THIN FILMS BY ELECTRODEPOSITION
IN A POORLY BUFFERED SOLUTION
Laboratoire de Chimie Analytique et d’Electrochimie, Faculté des Sciences de Tunis, Campus Universitaire, 1060 Tunis, Tunisie
* Corresponding author. E-mail :firstname.lastname@example.org
Received : 27 March 2002; revised version accepted : 25 May 2002
CuInSe2 thin films were prepared by electrodeposition from a solution with the pH fixed by a mixture of sulfuric acid and sodium sulfate. Layers with more selenium and less indium were obtained. This result is attributed to a partial transformation of the In3+ ions in InOH2+ ions in the vicinity of the electrode- solution interface, due to a local pH increase caused by the reduction of the selenious acid. The local pH variation may also be considered as a tool to modulate the selenium content of the films.
Keywords: Thin layers; Electrodeposition; CIS; Buffer solution; Gap.