Effect of intermittent spray on optoelectronic properties of ZnO nanocrystallites synthesized by chemical spray pyrolysis

摘要

Nanocrystalline ZnO films were synthesized by a chemical spray pyrolysis of zinc acetate solution. The deposition temperature (450°C) was kept constant by obstructing the spray after regular intervals. The XRD patterns of ZnO films were preferably oriented along c-axis (0 0 2) plane with the hexagonal wurtzite structure. The dependence of texture coefficient (TC) and standard deviation (σ{sub}g) on spray obstruction time was also studied. The films synthesized were highly transparent (>94%) and conductive (dark conductivity 24.67Ω-cm). The energy gap of the film was found to vary between 3.18eV to 3.22eV. The variation in sheet resistance (Ω/□) and figure of merit (Φ{sub}(TC)) was also studied in view of their possible applications in optoelectronic devices.