CuInSe2 (CIS) thin films were deposited on Mo/glass substrates by one-step electrodeposition from aqueous baths containing CUSO4, In-2 (SO4)(3) and SeO2 with Li2SO4 electrolyte. The quality of the electrodeposited films depended on the presence of pH buffer in the bath. CIS films deposited from non-pH buffered baths showed pronounced (112) orientation, while films exhibiting more random orientation were obtained from pH buffered baths. Denser, smoother samples were obtained from non-pH buffered baths, though with no difference in film composition. As-deposited films exhibit low crystallinity and require recrystallization by annealing in H2Se. Best devices, similar to 9%, were obtained with CuInSe2 films deposited from non-pH buffered baths. (C) 2007 Elsevier B.V. All rights reserved.