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On the Impact of Siloxanated Side Chains on the Properties of Semiconducting Polymers
Benoit Heinrich,Thomas Heiser,Patrick Leveque,Nicolas Leclerc,Stephane Mery 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
For several years, semiconducting polymers substituted with siloxane side chains have shown remarkable charge transport properties, without being able to clearly identify its origin. To help clarify this matter, different series of π-conjugated polymers functionalized with either neat-alkylated or siloxane containing side-chains were synthesized and extensively characterized. While electronic molecular properties were little affected by the lateral chain change, the siloxane-functionalized polymers systematically showed enhanced charge carrier mobility values, suggesting the effect of a modified structure and/or morphology. Effectively, an extended X-ray scattering study of bulk materials and thin films evidenced an improved stacking of backbones enhancing the efficiency of conduction pathways. These results were explained in compliance with the intrinsic properties of siloxane. Molecular design rules were specified for the rational substitution of semiconducting polymer side chains.
Photoactive Organic/Inorganic Hybrid Materials with Nanosegregated Donor–Acceptor Arrays
Fabrice Mathevet,Xiaolei Zhu,Cheriehan Hessin,Aude Salam,Lydia Sosa-Vargas,David Kreher,Chihaya Adachi,Anna Proust,Pierre Mialane,Jerome Marrot,Aude Bouchet,Michel Sliwa,Stephane Mery,Benoit Heinrich 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We designed and synthesized a first example of mesogenic donor-acceptor polyoxometalate (POM)-based hybrid. The structural and electronic properties of the hybrid compound were evaluated through combination of small- and wide-angle X-ray scattering, optical microscopy, electrochemistry and photoluminescence. In the solid state, the compound behaves as a birefringent solid, displaying a lamellar organization in which double-layers of POMs and bis(thiophene)thienothiophene organic donors alternate regularly. Noticeably, the subunit organizations in the composite are similar to that observed for the individual POM and organic donor precursors. Photophysical studies showed that in the hybrid, the fluorescence of the organic donor unit is considerably quenched both in solution and in the solid state, which is attributed to occurrence of intramolecular charge-separated state.