Triblock-Terpolymer-Directed Self-Assembly of Mesoporous TiO2: High-Performance Photoanodes for Solid-State Dye-Sensitized Solar Cells

Journal article

A new self-assembly platform for the fast and straightforward synthesis of bicontinuous, mesoporous TiO 2 fi lms is presented, based on the triblock terpolymer poly(isoprene - b - styrene - b - ethylene oxide). This new materials route allows the co-assembly of the metal oxide as a fully interconnected minority phase, which results in a highly porous photoanode with strong advantages over the state-of-the-art nanoparticle-based photoanodes employed in solidstate dye-sensitized solar cells. Devices fabricated through this triblock terpolymer route exhibit a high availability of sub-bandgap states distributed in a narrow and low enough energy band, which maximizes photoinduced charge generation from a state-of-the-art organic dye, C220. As a consequence, the co-assembled mesoporous metal oxide system outperformed the conventional nanoparticle-based electrodes fabricated and tested under the same conditions, exhibiting solar power-conversion effi ciencies of over 5%.© 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.

Authors: Docampo, P; Stefik, M; Guldin, S; Gunning, R; Yufa, N

• Publication status: Published
• Journal: ADVANCED ENERGY MATERIALS
• Volume: 2
• Issue: 6
• Pages: 676-682
• Publication date: 2012-06-01
• DOI: 10.1002/aenm.201100699
• EISSN: 1614-6840
• ISSN: 1614-6832
• Language: English
• Keywords: solid state; mesoporous; dye-sensitized; self-assembly; block copolymers