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Báo cáo hóa học: " Mesoporous nitrogen-doped TiO2 sphere applied for quasi-solid-state dye-sensitized solar cell"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Mesoporous nitrogen-doped TiO2 sphere applied for quasi-solid-state dye-sensitized solar cell | Xiang et al. Nanoscale Research Letters 2011 6 606 http www.nanoscalereslett.eom content 6 1 606 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Mesoporous nitrogen-doped TiO2 sphere applied for quasi-solid-state dye-sensitized solar cell Peng Xiang Xiong Li Heng Wang Guanghui Liu Ting Shu Ziming Zhou Zhiliang Ku Yaoguang Rong Mi Xu Linfeng Liu Min Hu Ying Yang Wei Chen Tongfa Liu Meili Zhang and Hongwei Han Abstract A mesoscopic nitrogen-doped TiO2 sphere has been developed for a quasi-solid-state dye-sensitized solar cell DSSC . Compared with the undoped TiO2 sphere the quasi-solid-state DSSC based on the nitrogen-doped TiO2 sphere shows more excellent photovoltaic performance. The photoelectrochemistry of electrodes based on nitrogen-doped and undoped TiO2 spheres was characterized with Mott-Schottky analysis intensity modulated photocurrent spectroscopy and electrochemical impedance spectroscopy which indicated that both the quasiFermi level and the charge transport of the photoelectrode were improved after being doped with nitrogen. As a result a photoelectric conversion efficiency of 6.01 was obtained for the quasi-solid-state DSSC. Introduction Since a mesoscopic TiO2-based dye-sensitized solar cell DSSC was reported by O Regan and Gratzel in 1991 1 DSSC has emerged as a promising candidate for the practical photovoltaic application due to its low manufacturing cost and high energy conversion efficiency. Even though DSSC is now commercially available market expansion is still limited because of the use of a liquid electrolyte which always signifies instability due to the leakage of the solvent and the erosion of the electrode. It seems a good way to replace the liquid electrolyte by a solid-state or quasi-solid-state medium 2 3 . Unfortunately compared with liquid electrolyte solidstate or quasi-solid-state DSSC still presents lower energy conversion efficiency. Therefore how to improve the performance of DSSC composing of .