Zno nanowires for sensing and power generation for system-on-package technology
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As the science and technology advance, people are looking for new discoveries to solve the existing problems and improve the quality of life. In this processes of development, nanoscience and nanotechnology have attracted technologists' attention and turned out to be one of the most promising technologies that could have a revolutionary impact. Znic Oxide (ZnO) nanostructures, in particular nanowires (NWs), have the potential to be one of such revolutionary material. ZnO is a piezoelectric, transparent and semiconducting material. With a direct band gap of 3.37eV and large excitation binding energy (60meV), ZnO exhibits near-UV emission, and transparent conductivity. ZnO NWs, with all of the properties of bulk ZnO, have other properties that are distinct to nanoscale material. All of these make ZnO NWs a very unique material that has many potential applications in system miniaturization. System-on-package (SOP) technology is a new concept developed to solve the integration problem in microelectronic industry. SOP technology paradigm provides system-level miniaturization in a package size that makes today's hand-held devices into multi-functional systems, with applications ranging from computing, wireless communications, health care to personal security. The SOP is a system miniaturization technology that ultimately integrates nanoscale thin film components for batteries, thermal structures, active and passive components in low cost organic packaging substrates, leading to micro to nanoscale modules and systems. The goal of this research is to investigate and utilize the unique properties of ZnO NWs and apply them to the fabrication of devices that can be integrated with SOP platform. The issues include developing techniques to manipulate and align ZnO NWs; developing contact preparation method to improve the contact conductance for the fabrication of ZnO NW based devices. Also, the investigation of the oxygen diffusion coefficient in ZnO NWs is carried out, which serves as the basis of ZnO NWs for sensing applications. Two practical applications, which include fabricating and characterizing SOP compatible ZnO NW based bio-sensor and SOP compatible ZnO NW based nano-generator, are evaluated. Finally the remaining work beyond the scope of the thesis is outlined.