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Proceedings Paper

Donor/acceptor morphology control for efficient and stable photovoltaic cells by using semiconducting diblock copolymers
Author(s): Keisuke Tajima; Shoji Miyanishi; Yue Zhang; Kazuhito Hashimoto
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Paper Abstract

Poly(3-alkylthiophene)-based diblock copolymers with controllable block lengths were synthesized by combining Grignard metathesis (GRIM) method, Ni-catalyzed quasi-living polymerization and a subsequent azide-alkyne click reaction to introduce a fullerene functionality into the side chains of one of the blocks. The fullerene-attached copolymers had good solubility (> 30 g L-1 in chlorobenzene) with high molecular weights (Mn > 20000). The diblock copolymer films showed the formation of clear nanostructures with the size of 20 nm in AFM phase image driven by the crystallization of poly(3-hexylthiophene) block and aggregation of the fullerene groups. The photovoltaic device based on the copolymers showed a power conversion efficiency of 2.5% with a much higher fill factor of 0.63 compared with the single component devices previously reported. These results indicate that the rational material designs enable to construct the donor-acceptor nanostructure suitable for the photovoltaic application without relying on the mixing of the materials.

Paper Details

Date Published: 25 September 2012
PDF: 3 pages
Proc. SPIE 8477, Organic Photovoltaics XIII, 847708 (25 September 2012); doi: 10.1117/12.945881
Show Author Affiliations
Keisuke Tajima, The Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)
Shoji Miyanishi, The Univ. of Tokyo (Japan)
Yue Zhang, The Univ. of Tokyo (Japan)
Kazuhito Hashimoto, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 8477:
Organic Photovoltaics XIII
Zakya H. Kafafi; Christoph J. Brabec; Paul A. Lane, Editor(s)

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