119th General Meeting of the KCS

Type Poster Presentation
Area 유기화학
Room No. 포스터발표장
Time 4월 20일 (목요일) 11:00~12:30
Code ORGN.P-210
Subject The conjugated polymers based on 6-(2-thienyl)-4H-thieno[3,2-b]indole(TTI) and isoindigo for organic photovoltaics
Authors 윤준태, 서홍석*
부산대학교 화학과, Korea
Abstract Conjugated polymers using 6-(2-thienyl)-4H-thieno[3,2-b]indole (TTI) and isoindigo (ID) were fabricated for high performance. The alternating copolymer and random copolymers including TTI and ID units were designed. The UV-vis absorption spectra of the random copolymers displayed greatly red shifted at maximum peaks and a more broad full width at the half maximum (fwhm) with rasing rate of ID unit. Conjugated polymers show deeper highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels with increased percentage of ID as electron accepting groups. When compared the alternating copolymer PTTIID with the random copolymer PTTIID-7, random copolymer PTTIID-7 showed higher JSC and FF values owing to the better morphology and proper hole mobility, making higher PCE value. The device composed of PTTIID-7 and PCBM (1:2) with chloronaphthalene (CN) additive showed a VOC of 0.63 V, a JSC of 12.3 mA/cm2, and a fill factor (FF) of 0.52, giving a power conversion efficiency (PCE) of 4.03%.
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