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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A Single Redox Shuttle for Electrochemical Photovoltaics: Reveal-ing Unrevealed Photoelectrochemistry via a Ruthenium Complex-Based Electrolyte

2014년 8월 28일 14시 25분 55초
INOR.P-221 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
김정윤, 손호진1, 정낙천*
대구경북과학기술원(DGIST) 신물질과학과, Korea
1고려대학교 소재화학과, Korea
Dye-sensitized solar cells (DSCs), distinctively those comprising of molecular chromophores and redox shuttles, have shown potential promise as a type of electrochemical photovoltaic devices. Ruthenium complexes, with chemical modification to various types, have proven their excellence as chromophores in the DSCs, but never been considered as redox shuttle. Here we report a most primitive version of ruthenium complex, Ru(bpy)32+. In contrast to that all redox shuttles, which have been discovered or developed so far, are conspicuously the shape coupled with the forms mixing both reduced and oxidized ones, this ruthenium-based shuttle performs high photovoltages although it operates solely without an oxidized pair. Exploiting this new “single shuttle”, we find unexpected, interesting features: (i) abnormal shape of IPCE curves; (ii) gigantic IPCEs relative to photocurrent density; (iii) discordance between the photocurrent density and the overlap integral of IPCE; (iv) non-linearity of photocurrent density change versus light intensity change; (v) relative higher efficiency under lower power illumination. Especially from the last one, we caught a hint that this type of cells is better to use in modest light or in-door light condition. In fact, the efficiency was even 5.8-fold enhanced by reducing illumination power. We believe these new findings will prove transferable and thereby, advancing developing new redox shuttles as well as yielding high performance devices.