Well-Defined All-Conducting Block Copolymer Bilayer Hybrid Nanostructure: Selective Positioning of Lithium Ions and Efficient Charge Collection

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Department of Chemical Engineering, Pohang University of Science and Technology, San31, Nam-gu, Pohang, Kyungbuk 790-784, Korea
*Address correspondence to [email protected]
Cite this: ACS Nano 2014, 8, 7, 6893–6901
Publication Date (Web):June 10, 2014
https://doi.org/10.1021/nn5016083
Copyright © 2014 American Chemical Society
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Abstract

A block copolymerization of nonfunctionalized conducting monomers was developed to enable the successful synthesis of a highly insoluble 3,4-(ethylenedioxy)thienyl-based all-conducting block copolymer (PEDOT-b-PEDOT-TB) that could encapsulate nanocrystalline dyed TiO2 particles, resulting in the formation of an all-conducting block copolymer bilayer hybrid nanostructure (TiO2/Dye/PEDOT-b-PEDOT-TB). Lithium ions were selectively positioned on the outer PEDOT-TB surface. The distances through which the positively charged dye and PEDOT-TB(Li+) interacted physically or through which the TiO2 electrode and the Li+ centers on PEDOT-TB(Li+) interacted ionically were precisely tuned and optimized within ca. 1 nm by controlling the thickness of the PEDOT blocking layer (the block length). The optimized structure provided efficient charge collection in an iodine-free dye-sensitized solar cell (DSC) due to negligible recombination of photoinduced electrons with cationic species and rapid charge transport, which improved the photovoltaic performance (η = 2.1 → 6.5%).

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PEP mechanism, Raman spectra, 1D XRD spectra, UV–vis spectra, DFT calculation, and photovoltaic performances of DSCs. This material is available free of charge via the Internet at http://pubs.acs.org.

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