Preparation And Properties Of Zinc Oxide Block, Thin Films And Nanocrystals

Zinc oxide (ZnO) crystal is one of the most important photoelectric materials at the present time. It is a well-known piezoelectric material for its high inductivity and mechanical coupling coefficient. Like 6H-SiC (3.0eV, 2K) and GaN( 3.5eV) ,ZnO is a wide direct band gap (3.37eV) semiconductor. Since the excitons formed in it have a high binding energy of 60 meV, it can emit photons of ultraviolet light. ZnO has showed a wide range of technological applications including sensers, pressure cells, optical waveguides, activators, etc. In fact, ZnO has some advantages over GaN not only for its wavelength but also for its life span. The growth of bulk ZnO single crystals will bring about a large development on light emitting diodes (LED) and laser systems.ZnO thin films with a c-axis orientation, which shows advantageous characteristics such as low price and easy to be doped, has been demonstrated for its applications in surface acoustic wave devices (SAW), bulk acoustic wave devices (BAW) and solar cells.In recent years, nanosize semiconductor has been extensively investigated due to its special electrical and optical characteristics. ZnO nanocrystals has been demonstrated that their physical properties are related to shape and size of the nanomaterials. Synthesizing high quality nanomaterials with new and simple methods is an important task for material science.In this paper, we prepared ZnO bulk single crystals, ZnO thin films and ZnO nanocrystals. And their structural characteristics and material properties were also studied and discussed.1, Hydrothermal Growth of Bulk ZnO Single CrystalIn this research, bulk single crystals of ZnO were grown by the...