Design of Micro/Nanostructured Materials for Flexible Electronics and Sensing Applications

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Design of Micro/Nanostructured Materials for Flexible Electronics and Sensing Applications
Lim, Seongdong
Ko, Hyunhyub
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Graduate School of UNIST
Nowadays, the rapid development of modern society with the Fourth Industrial Revolution has initiated technological advances in electronic devices for improving the quality of human life. In addition, electronic devices have been evolved into human-interactive wearable electronics for smart healthcare systems, internet of things, augmented reality, and humanoid robots. Therefore, innovative and multirole-featured flexible sensing devices with advanced communication capability becomes considerably important for future electronics beyond the classical processing devices complying with Moore’s law. In particular, photodetectors are essential for detecting light by transducing an electrical signal, enabling recognition and imaging of some objects with contactless detection. In addition, mechanosensors offer useful physical information such as touch and gesture through direct contact with objects. The introduction of micro/nanostructures into electronic sensors can be helpful to maximize the performance of both photodetectors and mechanosensors with improved light absorption and effective transmission of external forces, respectively. Furthermore, the novel design of device architectures with appropriate use of unique properties of the base materials allows diverse functionalities to flexible sensors, which is advantageous in next-generation electronic devices. In this thesis, we demonstrate highly sensitive and multifunctional flexible sensing devices for future electronics via a novel design of micro/nanostructured materials. In Chapter 1, we briefly introduce the basic concepts and current technologies of flexible photodetectors and mechanosensors, respectively. In Chapter 2, we develop unique design of flexible photodetectors with both omnidirectional and broadband light-detection capabilities based on hierarchical ZnO nanowire arrays on flexible honeycomb-structured Si membranes. As another future proximity sensors, in Chapter 3, we suggest new fabrication method for hierarchical organic-inorganic hybrid perovskite nanoribbon arrays with controlled internal nanorod structures. The hierarchical perovskite nanoribbon based flexible photodetectors exhibit high photoresponsivity as well as self-powered operation and polarization-sensitive detection capabilities. Chapter 4 describes spacer-free, ultrathin, and highly sensitive triboelectric mechanosensors based on human skin-inspired hierarchical nanoporous and interlocked microridge structured polymers with gradient stiffness. Finally, we summarize this thesis with future prospects and challenges of this field in Chapter 5.
Department of Chemical Engineering
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