... band gap and the energetic position of thevalence band maximum and conduction band minimum of ZnO are very close to that of TiO2 and that the wurtzitestructure of ZnO favors the formation of ... A2 and A3 were 2.1, 2.2 and 2.0 9 109wir-es cm-2, respectively, which are much higher than that of samples B1, B2 and B3 (1.5, 1.6, 1.2 9 109wires cm-2).The different thicknesses of ... densities of nanowire arraysfor samples B1, B2 and B3 were lower than that of samplesA1, A2 and A3, the short circuit current density (Isc)increased from 1.61–1.97 to 1.93–2.25 mA cm-2, and...