A Clean Low‐Temperature ZnO Deposition Method for Multipurpose Applications

Abstract

Zinc oxide (ZnO) was dissolved in an aqueous solution of ammonia and hydrogen peroxide. According to XRD characterization, this precursor solution yielded crystalline zincoxide after evaporation and thermal treatment at 90 °C for 2 h. The processability of this precursor solution allowed for ZnO deposition on cellulose paper, which is an example of a thermolabile substrate. Cellulose filter paper that was impregnated with this solution and subsequently thermally treated at 90 °C for 2 h had nanostructured crystalline ZnO well adhered to its surface. This composite material was characterized by XRD and scanning electron microscopy (SEM). The described precursor solution also assisted in the preparation of ZnO porous layers for dye‐sensitized solar cells (DSC). For this purpose, it was mixed with ZnO nanopowder dispersed in ethanol. The mixture was then sprayed on transparent conductive oxide substrates. In this way porous films were obtained after heat treatment at 90 °C for 2 h. Under standard testing conditions (AM1.5G, 100 mW cm–2), a device prepared with (Bu4N)2[Ru(dcbpyH)2(NCS)2] (dcbpy = 4,4′‐dicarboxy‐2,2′‐bipyridine) (N‐719) dye and a film thickness of 5 μm exhibited 1.43 % efficiency.

Temperature Dependent Photoluminescence of ZnO Nanorods Synthesized by Hydrothermal Method

“…The space anisotropy of one-dimensional (1D) structures, in comparison with zero-dimensional structures, provides a better model system to study the dependence of electronic transport, optical and mechanical properties on size confinement and dimensionality [1]. 1D ZnO have a promising future as applications in electronic and optoelectronic devices, because they are expected to improve the performance of various nanodevices such as short-wavelength lasers, nanostructured solar cells, electroluminescent, field-emission devices and so on [2][3][4][5][6][7]. Since the first report on ultraviolet (UV) lasing from ZnO nanowires, remarkable effort has been dedicated to study the optical properties of 1D ZnO nanostructures [2].…”