Transparent conducting oxide (TCO) thin films have received extensive attention because of their diverse applications as transparent electrodes for optoelectronic devices such as solar cells and flat panel displays. Recently, this search has been oriented toward zinc oxide nanoporous in order to fabricate the low cost of new generation organic semiconductor based photovoltaic devices. In this work, transparent conducting ZnO thin films were prepared by spray pyrolysis technique using ZnCl₂ (2H₂0) as a precursor aqueous solution with concentration of 0.1M/l. The layers were deposited onto Sn-doped In₂O₃ (ITO) thin film using soda lime glass (SLG) substrate heated at 350°C. The ZnO films were annealed in room air, two hours, at 300°C. These films are crystallized in the hexagonal structure and are stoechiometrics. The samples are semiconductors with n-type conductivity. Scanning electron microscope (SEM) shows that the films are highly porous with small grain size and their diameter f is smaller than 100 nm. A cross section visualisation of ZnO film shows a thickness around 200 nm. X-ray diffraction (XRD) exhibits a strong evidence of ZnO crystallites orientation at 2q =34,28° according to the line (002). Transmittance measurements at 300 K varies versus substrate temperature (Ts) and yielded band gap values of 2,5 and 3,34 eV for Ts= 300°C and 400 °C, respectively. Here we discuss also the fabrication of such nanostructures and present results from ZnO nanofiber/polymer composite photovoltaic devices.

Key words: Nanoporous ZnO, Transparent Conductive Oxide, Spray Pyrolysis, Hybrid solar cells.

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