Cu and Cu2O films can be prepared on indium-doped tin oxide glass substrates by simple electrodeposition in a solution containing 0.1 MCu(NO3)(2) and 3 M lactic acid at different pH values. At low pH (pH=1.2), the uniform Cu films were obtained; when pH >= 7, the pure Cu2O films can be deposited. Especially, at pH=11, the deposited Cu2O films exhibited cubic surface morphology exposing mainly {100} plane; in contrast, the films consisting of semi-spherical particles were obtained when the solution was being stirred for 2 weeks prior to use. The possible growth process and mechanism were comparatively discussed. (C) 2012 Elsevier B. V. All rights reserved.