Donor/acceptor morphology control for efficient and stable photovoltaic cells by using semiconducting diblock copolymers

Keisuke Tajima; Shoji Miyanishi; Yue Zhang; Kazuhito Hashimoto

doi:10.1117/12.945881

25 September 2012 Donor/acceptor morphology control for efficient and stable photovoltaic cells by using semiconducting diblock copolymers

Keisuke Tajima, Shoji Miyanishi, Yue Zhang, Kazuhito Hashimoto

Author Affiliations +

Proceedings Volume 8477, Organic Photovoltaics XIII; 847708 (2012) https://doi.org/10.1117/12.945881
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

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.

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Keisuke Tajima, Shoji Miyanishi, Yue Zhang, and Kazuhito Hashimoto "Donor/acceptor morphology control for efficient and stable photovoltaic cells by using semiconducting diblock copolymers", Proc. SPIE 8477, Organic Photovoltaics XIII, 847708 (25 September 2012); https://doi.org/10.1117/12.945881

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KEYWORDS

Fullerenes

Nanostructures

Absorption

Crystals

Photovoltaics

Polymers

Semiconductors

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