Designing High Efficiency Molecular Doping Processes for Optimizing Electrical Conductivity and Thermoelectric Conversion Efficiency of Conjugated Polymers
공액고분자의 전기전도도와 열전출력 최적화를 위한 고효율 분자도핑공정 설계 연구
- 주제(키워드) Conjugated polymer , Molecular doping , Electrical conductivity , Organic thermoelectric , Doping method , Sequential doping , Hybrid doping , Cascade doping , Solvent combination doping
- 주제(DDC) 547
- 발행기관 아주대학교 일반대학원
- 지도교수 김종현
- 발행년도 2024
- 학위수여년월 2024. 8
- 학위명 박사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000033854
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Conjugated polymers (CPs) are attracting attention as suitable materials for organic thermoelectric devices due to their process convenience, mechanical stability, biocompatibility, and eco-friendliness. However, compared to inorganic-based thermoelectric materials, conjugated polymers have significantly lower electrical properties, which limits the implementation of high-performance thermoelectric devices. To solve this problem, this thesis aimed to develop high-performance organic thermoelectric devices by improving the electrical conductivity of conjugated polymers through doping. The goal was to improve the electrical conductivity and thermoelectric performance of high-performance organic thermoelectric devices by focusing on the design, selection, and doping methods of CPs to enhance the doping efficiency. Chapter 1 provides a comprehensive overview of the essential properties of CPs, doping mechanisms, methods, and the effects of enhanced doping efficiency on the performance of organic thermoelectric devices. Chapter 2 discusses strategies to increase doping efficiency through material-driven approaches, such as adjusting the bulkiness of the side chains of conjugated polymers to facilitate dopant diffusion and charge transport. Additionally, an examination of the effects of molecular weight on charge mobility and concentration post-doping. Comparative studies on the thermoelectric performance of polymers doped with various oxidizing agents, such as F4-TCNQ and AuCl3, are presented. Lastly, the selection of solvents for dopants is optimized to improve the dissolution and diffusion of dopants into CP thin films, thereby enhancing their electrical properties Chapter 3 presents systematic research on strategies to enhance doping efficiency from a process perspective. This chapter describes hybrid doping techniques that combine sequential and blend doping to maximize carrier concentration by doping all areas within CP thin films, thereby optimizing electrical conductivity and device performance. The chapter further introduces cascade doping, which involves sequential doping with different dopants to maximize charge concentration and improve electrical conductivity. Finally, solvent combination doping is investigated to optimize solvent properties, enhancing dopant diffusion efficiency after pristine film casting and achieving high-performance, highly conductive organic thermoelectric devices. This thesis systematically optimizes materials and processes, deepening the understanding of the complex interplay between conjugated polymer design, doping processes, and thermoelectric properties. It presents a series of methodological advancements aimed at optimizing the performance of organic thermoelectric devices. These advanced methodologies are expected to significantly impact the development of organic thermoelectric energy conversion technologies.
more목차
Chapter 1. Introduction 1
1.1. Conjugated polymers 1
1.2. Doping of conjugated polymers 3
1.3. Doping process 7
1.4. Organic thermoelectrics 10
Chapter 2. Enhancing doping efficiency through engineering of side-chains and molecular weight of conjugated polymers and types of dopants, and dopants solvents 12
2.1. Effects of side-chain in conjugated polymers on electrical and thermoelectric properties 14
2.2. Effects of molecular weight of conjugated polymers on electrical and thermoelectric properties 25
2.3. Effects of dopants on electrical properties and thermoelectric properties of conjugatedpolymers 41
2.4. Effects of dopant solvents on electrical properties of conjugated polymers 62
Chapter 3. Development of high efficiency molecular doping processes for conjugated polymers 73
3.1. Hybrid doping 75
3.2. Cascade doping 97
3.3. Solvent combination doping 117
Chapter 4. Concluding remarks 179
References 182
Chapter 1. References 182
Chapter 2. References 185
Chapter 3. References 197
List of Publications 212
List of Presentations 215
List of Patents 217
Korean Abstract (국문 초록) 218
