Figure 6From: Improved conversion efficiency of Ag2S quantum dot-sensitized solar cells based on TiO2 nanotubes with a ZnO recombination barrier layer Energy diagram and dark current. (a) Energy diagram of Ag2S-sensitized ZnO/TNT solar cells and (b) the dark current of the Ag2S(4)/ZnO/TNT and Ag2S(4)/TNT electrodes.Back to article page