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Saito M, Osaka I, Suzuki Y, et al. Highly Efficient and Stable Solar Cells Based on Thiazolothiazole and Naphthobisthiadiazole Copolymers. Sci Rep. 2015;5:14202doi: 10.1038/srep14202.
Saito, M., Osaka, I., Suzuki, Y., Takimiya, K., Okabe, T., Ikeda, S., & Asano, T. (2015). Highly Efficient and Stable Solar Cells Based on Thiazolothiazole and Naphthobisthiadiazole Copolymers. Scientific reports, 514202. https://doi.org/10.1038/srep14202
Saito, Masahiko, et al. "Highly Efficient and Stable Solar Cells Based on Thiazolothiazole and Naphthobisthiadiazole Copolymers." Scientific reports vol. 5 (2015): 14202. doi: https://doi.org/10.1038/srep14202
Saito M, Osaka I, Suzuki Y, Takimiya K, Okabe T, Ikeda S, Asano T. Highly Efficient and Stable Solar Cells Based on Thiazolothiazole and Naphthobisthiadiazole Copolymers. Sci Rep. 2015 Sep 23;5:14202. doi: 10.1038/srep14202. PMID: 26395221; PMCID: PMC4585800.
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Sci Rep. 2015 Sep 23;5:14202. doi: 10.1038/srep14202.

Highly Efficient and Stable Solar Cells Based on Thiazolothiazole and Naphthobisthiadiazole Copolymers.

Scientific reports

Masahiko Saito, Itaru Osaka, Yasuhito Suzuki, Kazuo Takimiya, Takashi Okabe, Satoru Ikeda, Tsuyoshi Asano

Affiliations

  1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan.
  2. Emergent Molecular Function Research Group, RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.
  3. Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Chiyoda-ku 102-0075 Japan.
  4. Central Technical Research Laboratory, JX Nippon Oil &Energy Corporation, 8, Chidoricho, Naka-ku, Yokohama 231-0815, Japan.

PMID: 26395221 PMCID: PMC4585800 DOI: 10.1038/srep14202

Abstract

A critical issue in polymer-based solar cells (PSCs) is to improve the power conversion efficiency (PCE) as well as the stability. Here, we describe the development of new semiconducting polymers consisting of thiophene, thiazolothiazole and naphthobisthiadiazole in the polymer backbone. The polymers had good solubility and thus solution-processability, appropriate electronic structure with narrow band gaps of ~1.57 eV and low-lying HOMO energy levels of ~-5.40 eV, and highly ordered structure with the favorable face-on backbone orientation. Solar cells based on the polymers and PC71BM exhibited quite high PCEs of up to 9%. More interestingly, the cells also demonstrated excellent stability as they showed negligible degradation of PCE when stored at 85˚C for 500 hours in the dark under nitrogen atmosphere. These results indicate that the newly developed polymers are promising materials for PSCs in the practical use.

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