https://scholar.dgist.ac.kr/handle/20.500.11750/4360 2026-04-22T06:15:05Z https://scholar.dgist.ac.kr/handle/20.500.11750/12824 Title: Design and Synthesis of a New Non-Fullerene Acceptor for High-Performance Photomultiplication-Type Organic Photodiodes Author(s): Sim, Hye Ryun; Kang, Mingyun; Yu, Seong Hoon; Nam, Geon-Hee; Lim, Bogyu; Chung, Dae Sung Abstract: Photomultiplication-type organic photodiodes (PM-OPDs) rely on acceptor molecules for both charge separation and efficient gain generation. Herein, a new non-fullerene acceptor is designed and synthesized by introducing thienylenevinylene (TV) groups into the conventional 2,2MODIFIER LETTER PRIME-[[6,6,12,12-tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2MODIFIER LETTER PRIME,3MODIFIER LETTER PRIME-dMODIFIER LETTER PRIME]-s-indaceno[1,2-b:5,6-bMODIFIER LETTER PRIME]dithiophene-2,8-diyl]bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis[propanedinitrile] (ITIC) structure. The resulting TV-ITIC acceptor possesses not only extended pi-conjugation length, which leads to lower energy bandgap as well as deeper lowest unoccupied molecular orbital (LUMO) level, but also enhanced hydrophobic characteristics, owing to the increased volumetric portion of the aliphatic chain, which improves the miscibility with the donor polymer semiconductor, poly(3-hexylthiophene-2,5-diyl) (P3HT). Moreover, pristine TV-ITIC films consist of intrinsically well-ordered anisotropic crystallites, which are confirmed by 2D grazing incidence X-ray diffraction (2D-GIXD) analysis. All of these photophysical properties are beneficial for efficient exciton separation, electron trapping, and charge injection abilities of PM-OPDs compared to those obtained with conventional ITIC. Because of such synergetic contributions of TV-ITIC to the photomultiplication mechanism, the resulting optimized PM-OPD exhibits a high external quantum efficiency (>74,000%) and a large specific detectivity (>10(12) Jones). © 2020 Wiley-VCH GmbH 2021-01-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/12814 Title: Thermoelectric power factor exceeding 50 mu W m(-1)K(-2)from water-borne colloids of polymer semiconductors Author(s): Nam, Gwang Hui; Ha, Jae Un; Chung, Dae Sung Abstract: An environmentally benign process for the fabrication of polymer thermoelectrics is proposed based on a miniemulsion synthesis for transferring polymer semiconductors dissolved in organic solvents to aqueous media with surfactants. Considering that the particle size of the colloid and concentration of the surfactant micelles can affect the final morphology of films cast from the colloidal solution, the dialysis time for extraction of the surfactant from the colloidal solution was systematically varied to achieve poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-C-14) colloidal films with diverse morphologies. Morphological and structural analyses indicated that a longer dialysis time produced a larger particle size owing to Ostwald ripening, in addition to a lower interparticle depletion force as a result of the reduced amount of surfactant micelles. These competing phenomena in the colloidal solutions prior to solidification yielded smoother and more continuous film morphologies as the dialysis time increased. Interestingly, although the charge carrier mobility and electrical conductivity gradually increased with the dialysis time as the film morphology became smoother, however, the Seebeck coefficient tended to increase as the crystalline disorder increased presumably because of the broadened density of states. The resulting organic thermoelectrics with the optimized film morphology rendered a high Seebeck coefficient of 495.96 mu V K(-1)and power factor of up to 54.89 mu W m(-1)K(-2). This approach opens the possibility of fabricating high-performance organic thermoelectrics with water as a processing solvent. This journal is © The Royal Society of Chemistry. 2020-09-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/12292 Title: 파장 선택성 전극을 구비한 유기 광다이오드 Author(s): 정대성; 윤성원 Abstract: 본 발명에 실시예에 따른 유기 광다이오드는, 제1 전극부 상에 배치되는 제1 중간층, 상기 제1 중간층 상에 배치되는 광활성층, 상기 광활성층 상에 배치되는 제2 중간층 및 상기 제2 중간층 상에 배치되는 제2 전극부을 포함한다. 여기서 상기 제2 전극부는, 상기 제2 중간층 상에 배치되는 제1 반사층, 상기 제1 반사층에 마주하는 방향에 배치되는 제2 반사층 및 상기 제1 반사층과 제2 반사층의 이격 간격 사이에 배치되는 광학스페이서를 포함하며, 상기 광학스페이서의 형성두께에 따라 목표 파장을 상기 광활성층 방향으로 제공할 수 있다. https://scholar.dgist.ac.kr/handle/20.500.11750/12285 Title: 저온 용액 공정을 이용한 유기 반도체 고분자 패턴의 제조방법 Author(s): 심규민; 정대성 Abstract: 본 발명은 저온 용액 공정을 이용하여 유기 반도체 고분자 패턴을 제조하는 방법에 관한 것으로, 보다 상세하게 기판의 제1영역을 표면처리하여 표면성질을 변화시키고, 유기 반도체 고분자를 포함하는 에멀전을 기판 위에 코팅한 후 알코올로 세척하는 단위 코팅 공정을 통해 유기 반도체 패턴을 제조하는 방법에 관한 것이다.