Cu-S nanocabbage films were synthesized on ITO substrate using pulse electrodeposition at elevated temperatures in aqueous solution. The bandgap of the films showed a dependence on reaction time and was found to increase linearly with reaction time. This increase was attributed to the change in phase and stoichiometry of the Cu-S nanocabbage films. The stability of Cu-S films is found to be improved substantially when deposited at higher temperature because the Cu atoms have sufficient energy to find the minimum energy site in the lattice. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3579419] All rights reserved.