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  • 09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Molecular Engineering of Indoline Based Organic Sensitizers Using Hexyl Thiophene

2014년 8월 28일 17시 23분 22초
ORGN.P-890 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
김광명, 홍종인*
서울대학교 화학부, Korea

Dye-sensitized solar cells (DSSCs) are under intensive investigation because of the cost-effectiveness and flexibility of devices. In 1999, such cells employing ruthenium complexes as sensitizers have achieved power conversion efficiency (η) over 11% under standard global air mass of 1.5. Meanwhile, metal-free organic dyes, usually with an electron donor?π bridge?electron acceptor (D? π ?A) configuration, have been actively pursued due to low material costs, easy synthesis, high molar extinction coefficients, and environmental friendly materials with respect to classical ruthenium dyes. In the past decade, many kinds of organic dyes with such configuration have been explored for DSSCs. It has been well known that one can improve device performance of DSSCs by facilitating electron injection and suppressing charge recombination. This can be done by controlling the assembly morphology of sensitizers on the TiO2 surface. Introduction of alkyl chains to the dye skeleton based on thiophene or its derivative has proved to be an effective method to improve the DSSC performance since they can not only prevent dye aggregation but also diminish the charge recombination between electrons and electron acceptors in the electrolyte. Herein, we report the design and synthesis of two new organic dyes with n-hexyl (H28 and H29) substituted at the spacer part, and their use as sensitizers in DSSCs. Compared to H28 (with alkyl chains at the acceptor position of dye), the JSC of H29 (with alkyl chains at the donor position of dye) was enhanced significantly from 9.05 to 14.3 mA cm?2, and VOC also increased from 570 to 670 mV due to the position of the incorporated alkyl chains. Details on the difference in the device performance between H28 and H29 will be discussed from the structural viewpoint.