Crystalline Matrix of Mesoporous TiO2 Framework for Dye-Sensitized Solar Cell Application

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• 作者：Chang Woo Kim ; Mi Jin Choi ; Seungyoon Lee ; Hyoungsook Park ; Bongjin Moon ; Yong Soo Kang ; Young Soo Kang
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：November 5, 2015
• 年：2015
• 卷：119
• 期：44
• 页码：24902-24909
• 全文大小：624K
• ISSN：1932-7455

文摘

In the present study, a well-ordered columnar porous TiO₂ matrix is designed via inverted triblock copolymers self-assembly and introduced as a photoanode for dye-sensitized solar cells (DSSCs). The inverted triblock copolymer, polystyrene-b-poly(ethylene oxide)-b-polystyrene, with the hydrophobic polystyrene segments at both ends of a hydrophilic poly(ethylene oxide) chain is synthesized by atom transfer radical polymerization. These reverse-featured triblock copolymers allow facile stacking to 3-dimensional (D) columnar porous matrix from 2-D porous film via hydrophobic鈥揾ydrophilic interaction. A 3-D matrix with well-ordered cylindrical pores is favorable to current flow by providing a direct electron pathway. DSSCs with a 3-D matrix of 2 渭m thickness show an enhanced photocurrent density of 8.1 mA cm^鈥? and higher photoconversion efficiency of 4.23% compared with those of TiO₂ nanoparticle photoelectrode under the illumination of 1 sun (AM 1.5 G 100 mW cm^鈥?). For the first time, we address that a 3-D metal oxide electrode with columnar pore is demonstrated via reverse-featured triblock copolymer and analyzed with relationships between their structural features and impedance spectroscopy for DSSCs.