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SEIGO ITO,TAKUROU N. MURAKAMI,SHAIK M. ZAKEERUDDIN,SUSUMU KAYAMA,MICHAEL GR€ ATZEL,Tetsuo Yazawa,MASAO MIZUNO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
Di®erent-sized nanocrystalline-TiO 2 particles have been used for the optimization of photovoltaice®ects of dye-sensitized solar cells (DSCs) using an ionic-liquid (IL) electrolyte. Ru dye (Z907)was used for the IL-DSC optimization. The TiO 2 nanoparticle sizes and the thickness of nano-crystalline-TiO 2 electrodes ranged from 13 nm to 81 nm and 2 ? m to 23 ? m, respectively. Theparticle size of the nanocrystalline TiO 2 ¯lm greatly a®ected the photovoltaic characteristics,particularly for the IL electrolyte due to limitation of the photocurrent by I?/I?3-di®usion. Theoptimized electrode for IL-DSC had a 15 ? m thickness using a 27 nm diameter of nanocrystalline-TiO 2 particles. In order to characterize the e®ect of the TiO 2 particle size on the photovoltaice®ects of IL-DSCs, a scanning electron micrograph (surface and cross section of nanoparticles),BET speci¯c surface area analysis, pore-size distribution analysis, photocurrent transient measurements, haze spectroscopy, photovoltaic measurements, incident-photon-to-currentconversion e±ciency spectroscopy and impedance measurement have been used.