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A Study on Silver Nanowire based Transparent Electrodes for Flexible and Stretchable Electronic Devices

  • Banseok You (대학원 전기전자공학과 반도체 및 나노전공)

초록/요약

Abstract : Future electronic devices have shown remarkable development due to the growing number of potential applications in wearable electronic devices, and there are evolving in a direction that is flexible, wearable, foldable and stretchable, with high performance. A recent increase in the demand for transparent electrodes has led to shortage in supply and an increase in the price of indium tin oxide (ITO) films deposited by sputter coating owing to coating speed limitations. Furthermore, flexibility has become one of the essential properties of transparent electrodes, accounting for the rapidly changing trend in electronics. In the case of an ITO-based electronic device, its performance is excellent, but it has a disadvantage that it can not be rigid and warped. There are several candidate materials (AgNW, Graphene, CNT, etc.) that will replace ITO. These materials can have a more flexible structure than ITO, but there are still necessary many improvements in terms of performance and reliability. Transparent electrodes based on percolated network of silver nanowires are well known for their excellent transparency, conductivity flexibility and stretchablity. Due to these unique characteristics, Silver nanowires attract great attention and are considered to be the potential electrode material of wide area and flexible and stretchable electronic devices. However, there are two main problem with the direct coating of silver nanowires on polymer substrate. It is a rough surface and poor substrate adhesion. Poor adhesion of a silver nanowire, which is not attached to the polymer substrate, the weak bond of silver nanowires to polymers limits their pattern-ability, which is one of the most important requirements in the electronics industry. In this thesis, we have developed a process to improve the drawbacks of silver nanowire electrodes for flexible and stretchable electronic devices, and discussed the application of flexible and stretchable electronic devices based on the improved silver nanowire and polymer substrate such as PUU, PDMS and cPI film. In chapter 2, Improving the performance of resistive switching memories, while providing high transparency and excellent mechanical stability, has been of great interest because of the emerging need for electronic wearable devices. In chapter 3, A highly stretchable and transparent pressure sensor based on a single layer silver nanowire electrode was successfully fabricated. To achieve this, we synthesized a stretchable and transparent adhesive, polyurethane urea, which was designed to firmly adhere to the silver nanowires by incorporating 2,2-bis(hydroxymethyl)butyric acid with a carboxylic group. In chapter 4, Realization of devices with enhanced stretchability and waterproof properties will significantly expand the reach of electronics. To this end, we herein fabricate an elastic transparent conductor that comprises silver nanowires on a hydroxylated polydimethylsiloxane substrate covered by polyurethane urea, which is fully compatible with both materials.

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Contents
Abstract --------------------------------------i
List of Figures ---------------------------------vi
Chapter I. Introduction ------------------------------1
I.1. Reference ---------------------------------4
Chapter II. Silver Nanowire and Colorness Polyemide Composite Electrode: Transparent and Flexible Resistive Switching Memory. ------------9
II.1. Introduction --------------------------------9
II.2. Experimental Section --------------------------15
II.2.1. Fabrication of the FT-RRAM device ------------15
II.2.2. ALD process --------------------------19
II.2.3. Characterization of the AgNW/cPI electrode and FT-ReRAM
device ----------------------------------19
II.3. Results and Discussion -------------------------21
II.4. Conclusion --------------------------------40
II.5. Reference --------------------------------42
Chapter III. A Wearable Capacitive Pressure Sensor with a Single Layer of AgNW based elastomeric composite electrode. ---------------48
II.1. Introduction -------------------------------48
III.2. Experimental Section -------------------------51
III.2.1. Materials ----------------------------51
III.2.2. Sythesis ----------------------------51
III.2.3. Pressure sensor fabrication -----------------53
III.2.4. Characterization ------------------------57
III.3. Results and Discussion ------------------------59
III.4. Conclusion -------------------------------84
III.5. Reference --------------------------------86
Chapter IV. Highly Stretchable and Waterproof ACEL Device based on Stable and Stretchable Transparent Electrode. --------------92
IV.1. Introduction -----------------------------92
IV.2. Experimental Section ------------------------96
IV.2.1. Materials and Synthesis -------------------96
IV.2.2. Fabrication of Stretchable Electrodes and EL Device ---96
IV.2.3. Evaluation of Stretchable Electrodes and ED Device ---97
IV.3. Results and Discussion -----------------------100
IV.4. Conclusion ------------------------------132
IV.5. Reference -------------------------------134
Chapter V. Summary -----------------------------143
List of Publications ------------------------------147

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