”Face-On” Oriented ^|^pi;-Conjugated Polymers Containing 1,3,4-Thiadiazole Moiety Investigated with Synchrotron GIXS Measurements: Relationship between Morphology and PSC Performance

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  • Fukuta Seijiro
    Department of Polymer Science, Engineering and Graduate School of Science and Engineering, Yamagata University Material Systems and Graduate School of Science and Engineering, Yamagata University
  • Koganezawa Tomoyuki
    Japan Synchrotron Radiation Research Institute
  • Tokita Masatoshi
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Kawauchi Susumu
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Mori Hideharu
    Department of Polymer Science, Engineering and Graduate School of Science and Engineering, Yamagata University Department of Organic Device Engineering, Graduate School of Science and Engineering, Yamagata University
  • Ueda Mitsuru
    Department of Polymer Science, Engineering and Graduate School of Science and Engineering, Yamagata University
  • Higashihara Tomoya
    Department of Polymer Science, Engineering and Graduate School of Science and Engineering, Yamagata University Material Systems and Graduate School of Science and Engineering, Yamagata University Japan Science and Technology Agency (JST), PRESTO

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  • ”Face-On” Oriented π-Conjugated Polymers Containing 1,3,4-Thiadiazole Moiety Investigated with Synchrotron GIXS Measurements: Relationship between Morphology and PSC Performance

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The detailed morphology was investigated on 1,3,4-oxadiazole (OXD) and 1,3,4-thiadiazole (TD) containing π-conjugated polymer films based on synchrotron GIXS measurements. Grazing-incidence wide-angle X-ray scattering (GIWAXS) proved that TD-containing polymers showed face-on orientation, which is, in general, favor for the polymer solar cell (PSC)　application. Density function theory calculation suggests that the favorable orientation is probably induced by the curvature of TD-containing polymer main chains. In addition, the bulk-heterojunction structure were evaluated by grazing-incidence small-angle X-ray scattering (GISAXS) and atomic force microscope (AFM). As a result, it was also found that the π-π stacking distance, correlation length and PC61BM cluster size had good relationship with the short circuit current density (Jsc) and fill factor (FF) in the PSC application.

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