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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effects of Strain-induced Crystallization of Electrospun Conjugated Polymer Nanoweb in Organic Photovoltaic Cells

2012년 2월 22일 17시 45분 40초
MAT.P-1183 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
김성균, 김태훈, 박종래
서울대학교 재료공학부, Korea
Crystallinity of conjugated polymer is closely correlated with performance of organic photovoltaic (OPV) cells. Improved crystallinity leads to an increase in hole mobility and optical absorption of the low-photon-energy region due to the increased conjugation length and π-π stacking of conjugated polymer. The higher hole mobility induces successful charge transportation and the higher optical absorption generates more charge carriers. As a result, these cause better photovoltaic performance. Until now, thermal annealing or solvent annealing was used for increasing the crystallinity of conjugated polymer in bulk-heterojunction (BHJ) structured OPV cells. However, these methods are limited to a few crystalline conjugated polymers such as poly(3-hexylthiophene) (P3HT). Also, there is room for improving the crystallinity of P3HT in BHJ structured OPV cells. Thus increasing the crystallinity of both amorphous conjugated polymers and P3HT is an important issue for achieving higher power conversion efficiency. Electrospinning is a facile method to fabricate most of polymers to nanofibers and nanowebs. Crystallinity of polymers is increased during the electrospinning process due to the elongation by electric field, and it can be enhanced by subsequent strain-induced crystallization. Thus the combination of electrospinning and strain-induced crystallization can be an easy and effective method to improve the crystallinity of amorphous conjugated polymers for better photovoltaic performance. In this work, crystallinity of electrospun conjugated polymer nanowebs was controlled by strain-induced crystallization. OPV devices composed of the electrospun fibers were prepared to study correlation between the crystallinity and power conversion efficiency of the OPV device.