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Design of Orthogonal Semiconducting Polymers for Solution-Processed and High-Resolution Organic Devices

Design of Orthogonal Semiconducting Polymers for Solution-Processed and High-Resolution Organic Devices
Alternative Author(s)
Issue Date
2021. 2
Organic electronics have recently attracted increased attention because of their unique capabilities of the solution processes; hence, they can be applied in a variety of potential applications, including flexible displays, wearable electronics, and stretchable devices. However, the fabrication of high-resolution pixelated polymer heterostructures, which are critical for manipulating charge carriers, excitons, and photons, remains a challenge. The obstacle is that initially deposited films are vulnerable to subsequent solution processes of the next layers, unless the solvents used in the processes are carefully selected, which is not trivial. This issue is valid not only for advanced printing processes, but also for the photolithography of semiconducting polymers. Beyond any technologies available, the utilization of photolithography, the workhorse in the current silicon industry, to pattern semiconducting polymers, would have an unprecedented impact on the field. This thesis comprises three topics. First, we design an 'orthogonal' organic electronic material conversion technology that is durable against external stimuli and examine the universality of this technology. Second, we investigate the fabrication of high-resolution organic light-emitting diode (OLED) microdisplays by applying the 'orthogonal' organic semiconductor gel conversion technology to light-emitting organic semiconductors. Third, we research on the fabrication of flexible all-organic gel-based organic field-effect transistors (OFETs) with improved interlayer interface bonding strength based on ‘orthogonal’ organic electronic materials (semiconductors, insulators). This dissertation comprises 7 chapters. The background and motivation for the research are introduced in Chapter 1. Chapter 2 analyzes the mechanism and design of semi-interpenetrating diphasic polymer network based ‘orthogonal’ organic semiconductor gel made by a sol-gel reaction and its thermodynamics behavior. Chapter 3 investigates the durability, versatility, and optoelectrical properties of the designed material. Besides, bulk structure and electrical characteristics are analyzed using various solution-processed organic semiconductors. In Chapter 4, ‘Orthogonal’ organic semiconductor gel was directly exposed to conventional photolithography to analyze physical properties and device fabrication according to the pattern process. And we analyze the submicron patterns and electrical characteristics of pattern devices using conventional photolithography and manufactures stacked high-resolution electronic devices using sequential solution processes. Chapter 5 is a study on designing ‘orthogonal’ light-emitting organic semiconductors to produce high-resolution RGB OLED microdisplays. We have performed various optoelectronic properties and durability analyses using the designed light-emitting materials. Chapter 6 is a study on flexible OFETs with improved interlayer interfacial bonding by the application of the corresponding material conversion technology to organic semiconductors and insulators. Finally, Chapter 7 summarizes the results of our research on the development of high-resolution organic electronic devices fabricated using the organic semiconductor material conversion technology that is durable to external stimuli.
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