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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Dye Stabilization and Performance Enhancement in Dye-Sensitized Solar Cells through Post-Assembly, Atomic Layer Deposition of Metal Oxides (TiO2, Al2O3, and SiO2)

등록일
2014년 8월 28일 23시 24분 38초
접수번호
1377
발표코드
ELEC1-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 10시 : 30분
발표형식
심포지엄
발표분야
전기화학 - Symposium for Young Electrochemists
저자 및
공동저자
손호진
고려대학교 신소재화학과, Korea
Recombination at the TiO2/electrolyte interface, detachment (desorption) of molecular dyes from photo-electrodes, and detachment (desorption) of molecular dyes from photo-electrodes are the major limitations for the operation of dye-sensitized solar cells (DSCs). Here we demonstrate a method to greatly inhibit these losses by growing transparent metal oxides (TiO2, Al2O3, and SiO2) on the dye-coated photo-electrode via atomic layer deposition (ALD) or cross-linking beween metal precusors. The post-metal oxide coating covers the highly convoluted surface of the TiO2 conformally and with a uniform thickness throughout the thousands of layers of nanoparticles. The subsequent coverage by metal oxides could provide a means to not only efficiently reduce the intermolecular interaction of dyes, but also to retard the interfacial charge recombination dynamics. DSCs incorporating these selective and self-aligned metal-oxide layers achieved a 30-40% increase in relative efficiency versus control uncoated cells. A detailed photophysical study using time-resolved fluorescence (TRF) spectroscopy is used to obtain a better understanding of the mechanism by which the post ALD treatment alters the performance of DSSCs. Additionally, the TiO2-enshrouded sensitizers largely resist detachment, even in pH 10.7 ethanol, a standard solution for intentional removal of molecular dyes from photo-electrode surfaces. The ALD post-treatment renders the otherwise hydrophobic dye-coated surface hydrophilic, thereby enhancing photo-electrode pore filling with aqueous solution. When subsequently operated in water, the ALD-treated DSC yielded a 42% increase in relative efficiency versus an untreated cell, with the improvement coming chiefly from increased photocurrent.

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