Cascade Doping Process for Preparation of Highly Conductive Polymer Films
- 주제(키워드) 테스트 , conducting polymer , chemical doping , doping efficiency , sequential doping , cascade doping
- 주제(DDC) 547
- 발행기관 아주대학교
- 지도교수 김종현
- 발행년도 2023
- 학위수여년월 2023. 2
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000032605
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Engineering methods for improving the electrical and thermoelectric properties of conjugated polymers through chemical doping have been evaluated in recent years. In the cascade doping method, two dopants are used, and the conjugated polymer site that has not been sufficiently doped through 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquino-dimethane first doping is introduced via secondary doping to increase the doping efficiency compared to that achieved using typical sequential doping. However, studies to improve performance by applying additional processes to the cascade doping method have not been widely examined. In this study, we introduced thermal annealing treatment into the cascade doping method and evaluated the electrical and thermoelectric characteristics. We observed outstanding doping efficiency under annealing conditions of 130 °C. Cascade-dopedpoly(2-([2,2′-bithiophen]-5-yl)-3,8-difluoro-5,10-bis(5-octylpentadecyl)-5,10-dihydroindolo[3,2-b]indole) showed high electrical conductivity of 1409.8 S/cm following annealing treatment; this value was an increase of 108% over that of the unannealed film (676.6 S/cm). In addition, the thermoelectric power factor, a performance evaluation index of thermoelectric devices, showed an S2σ value of 121.8 μWm-1K-2 following annealing treatment, which was 55% higher than that of the unannealed cascade-doped film (power factor = S2σ of 78.6 μWm-1K-2). Hall effect measurements and electron paramagnetic resonance analysis supported the generation of more efficient charge carriers through the thermal annealing strategy of cascade doping. In addition, spectroscopic and structural properties were investigated using UV-vis-NIR absorption spectroscopy, atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and grazing-incidence wide-angle X-ray scattering (GIXRD).
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