6th A-COE in Tainan, Taiwan で M1 五十嵐司君がポスター賞（ブロンズ）を受賞しました。司、おめでとう。
【授賞式の様子: 台湾精華大の Prof. Y. Chi 先生と。】
【タイトル】Development of soluble squaraine derivatives for efficient photovoltaic cells realizing power conversion efficiency of 4.9%
【著者】Tsukasa Igarashi, Hisahiro Sasabe, Yusuke Sasaki, Guo Chen, Ziruo Hong, Junji Kido
【アブストラクト】 In this study, we have synthesized a series of amino-SQ derivatives with SQ(OH)4 skeleton named SQ-RP (SQBP, SQ-OP and SQ-DP) containing phenyl- and different length of alkyl chains (Fig. 1). These SQs had absorption maxima at 650 nm with a high extinction coefficient (ε ) around 3.0Å~ 105 M-1 cm-1 in the solution. Although conventional SQ derivative is hardly solution in ordinary solvents except halogenated solvents, these SQ derivatives showed very high solubility up to 10 mg ml-1 in non-halogenated solvents, such as THF and toluene (Table 1). Further, these SQs have deep HOMO level of –5.3 eV suggesting high VOC in BHJ type OPV with a combination of fullerene derivatives. Finally, by using a combination of [6,6]-phenyl-C71 -butyric acid methyl ester (PC71 BM) as an acceptor, we obtained a PCE of 4.9% under AM 1.5 G solar illumination at 100 mW cm-1 at room temperature. We also investigated the relationship among the chemical structure, optical and electronic properties, and revealed an effective molecular design of SQs materials for high efficiency OPV devices.
