四川大学の Huang 教授とのスクアリリウム誘導体を用いた有機薄膜太陽電池の「Effects of different typed unsymmetrical squaraines on their material properties and Coulomb interactions in organic photovoltaic devices」と題する共同研究論文が英国化学会（Royal Society of Chemistry）の Materials Chemistry Frontiers に受理されました！
Title: Effects of different typed unsymmetrical squaraines on their material properties and Coulomb interactions in organic photovoltaic devices
By Lin Yang, Daobin Yang, Yao Chen, Jianglin Wu, Zhiyun Lu, Hisahiro Sasabe, Junji Kido, Takeshi Sano, and Yan Huang, Mater. Chem. Front. 2018, accepted.
Abstract: Three unsymmetrical squaraine (USQ) dyes bearing different molecular skeletons were employed as donor materials in bulk-heterojunction (BHJ) organic photovoltaics (OPVs). The different molecular skeleton types of USQs have influence on their solid-state packing mode, optical properties, frontier orbital energy levels, carrier mobility and photovoltaic performance. More importantly, it also induces distinct differences in the strength of Coulomb interactions between the charge pairs in USQ and fullerene phases. Through the single crystal analysis, film morphology characterization and device architectures investigation with various thicknesses of bathocuproine (BCP) layer, it finds: firstly, the photovoltaic performances of the three USQ:PC71BM systems show different sensitivity to different BCP thickness, which can indirectly reflect that there exist Coulomb attractions between USQ phase and electrons in PC71BM phase; Secondly, the low electron mobility (1 ~ 2 × 10-4 cm2 V-1 s-1) in USQ:PC71BM (1:3) blending films may be due to the combination of the well- mixed morphologies and strong Coulomb interactions; Thirdly, the USQ structures can affect the intensity of Coulomb attractions between USQ phase and electrons in PC71BM phase, and the influence can be enough large to no consideration of the morphology effect in some cases.
