Highly efficient and stable solar cells based on thiazolothiazole and naphthobisthiadiazole copolymers

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

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

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 ∼1.57eV and low-lying HOMO energy levels of ∼ 5.40eV, and highly ordered structure with the favorable face-on backbone orientation. Solar cells based on the polymers and PC 71 BM 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 500hours in the dark under nitrogen atmosphere. These results indicate that the newly developed polymers are promising materials for PSCs in the practical use.

Original languageEnglish
Article number14202
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Sep 23
Externally publishedYes

ASJC Scopus subject areas

  • General

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