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The Study of the Laser-driven Nanostructural Reorganization of Polymer Semiconducting Materials
Changhun Yun(윤창훈) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In organic electronic devices, solution-processed polymer semiconducting materials have been widely studied for a low-cost alternative to the conventional vacuum processed devices. Because the device performance from the polymer semiconductors can be governed by the nano-structure of the polymeric layer, lots of researchers have investigated the influence of solvent treatments during preparing the polymer thin layer. In this respect, we present the novel method to change the nano-structure of polymer semiconducting layer using laser-based heating. In this way, we have found that the laser irradiation can promote nanoscale reorganization of PEDOT:PSS layer and can enhance its electrical conductivity up to three orders of magnitude. For the polymer semiconducting layers in OLEDs, the laser-induced heat alters the solid or crystal structure so that the irradiated areas can be selectively deactivated in its electrical conductivity.
신축성 유기발광다이오드를 위한 은 나노와이어 기반의 신축성 투명 전극 기판 연구
정현수,고혁,박계춘,윤창훈,Jung, Hyunsu,Go, Hyeck,Park, Gye-Choon,Yun, Changhun 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.10
The proposed stretchable transparent electrodes based on silver nanowires (AgNWs) were prepared on a polyurethane (PU) substrate. In order toavoid the surface roughness caused by the silver nanowires, a titanium oxide ($TiO_2$) buffer layer was addedby coating and heating the organometallic sol-gel solution. The fabricated stretchable electrodes showedan electrical sheet resistance of $24{\Omega}sq^{-1}$, 78% transmittance at 550 nm, and an average surface roughness below 5 nm. Furthermore, the AgNW-based electrode maintained its initial electrical resistance under 130% strain testing conditions, without the assistance of additional conductive polymer layers. In this paper, the critical role of the $TiO_2$ buffer layer between the AgNW network and the PU substrate has been discussed.
유기발광다이오드를 위한 SiO<sub>2</sub> 나노파티클-전도성 고분자 기반의 내부 광추출 구조 개발
한주원 ( Joo Won Han ),김진희 ( Jin Hee Kim ),김용현 ( Yong Hyun Kim ),윤창훈 ( Changhun Yun ) 한국화상학회 2017 한국화상학회지 Vol.23 No.4
본 연구에서는 SiO<sub>2</sub> 나노파티클-전도성 고분자 PEDOT:PSS 복합 구조 기반의 유기발광다이오드용 내부 광추출 구조를 간단한 용액 공정으로 제작하였다. 또한, 다양한 농도의 SiO<sub>2</sub> 나노파티클을 PEDOT:PSS에 분산하여 그 구조를 확인하였고, 상부/하부 버퍼레이어의 도입이 내부 광추출 구조 형성에 미치는 영향에 관하여 알아보았다. In this work, we fabricate light extraction structures based on solution-processed SiO<sub>2</sub> nanoparticles-conducting polymer PEDOT:PSS composites for organic light-emitting diodes (OLEDs). The effects of various concentration of SiO<sub>2</sub> nanoparticles and the introduction of upper/bottom buffer layers on the morphology of light extraction structures are investigated.