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  • 02월 20일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 New Small-molecule Donors based on DPP for OPVs

2014년 2월 20일 16시 59분 37초
POLY.P-90 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 16일 (수요일) 16:00~19:00
저자 및
김유정, 임은희*
경기대학교 화학과, Korea
Organic photovoltaic cells (OPVs) have received much attention as highly promising devices producing infinite, renewable and clean energy from sunlight. Recently, the highest PCE of 12.0% has been reported at Heliatek. In the past decade, bulk heterojunction solar cells based on conjugated donor materials have dominated in research because they have excellent film-forming characteristics and good film morphology, resulting in high efficiency of these cells. However, polymeric donors are associated with a number of difficulties owing to their poor synthetic reproducibility, difficult purification procedures, end-group contamination and broad molecular weight. In contrast to polymers, small-molecule materials have shown advantages over polymeric materials, which include easy synthesis, purification and functionalization. Among various factors for PCE such as Jsc, Voc and FF, Jsc could be increased by low band gap attaching electron-rich unit like thiophene next to core of donor. However, effort of making low Eg could elevate HOMO energy level with the result of decreased Voc. The other way, donors substituted with electron-withdrawing unit such as fluorine, cyano and carbonyl group could enhance Voc due to relatively low HOMO level but that also makes wide Eg. In this work, π-conjugated small molecules based on diketopyrrolopyrrole (DPP) core were synthesized containing electron-withdrawing unit to analyze substituent effect. The effect of substitution pattern and device optimization also will be presented.