Determination of the band gap depth profile of the penternary Cu(In(1-X)GaX)(SYSe(1-Y))2 chalcopyrite from its composition gradient. - Bar, M.; Bohne, W.; Röhrich, J.; Strub, F.; Lindner, S.; Lux-Steiner, M. C.; Fischer, Ch.-H.; Niesen, T. P.; Karg, F. (Journal of Applied Physics, 2004)