https://scholars.lib.ntu.edu.tw/handle/123456789/444690
標題: | Modified structure of two-dimensional polythiophene derivatives by incorporating electron-deficient units into terthiophene-vinylene conjugated side chains and the polymer backbone: Synthesis, optoelectronic and self-assembly properties, and photovoltaic application | 作者: | Hsiow, C.-Y. Lin, Y.-H. Raja, R. Rwei, S.-P. Chiu, W.-Y. CHI-AN DAI LEE-YIH WANG |
公開日期: | 2016 | 卷: | 6 | 期: | 72 | 起(迄)頁: | 67976-67985 | 來源出版物: | RSC Advances | 摘要: | Molecular engineering on the conjugated side chains of two-dimensional (2D) conjugated polymers was conducted and its effect on the optical, electronic, self-assembly and photovoltaic properties was investigated. A new monomer, M2, was prepared by capping (E)-3′-(2-(2,5-dibromothiophen-3-yl)vinyl)-4,4′′-bis(2-ethylhexyl)-2,2′:5′,2′′-terthiophene, M1, with two heptanoyl groups, and then coupled with 5,5′-bis(trimethylstannyl)-2,2′-bithiophene via microwave-assisted Stille polymerization to produce a series of polythiophene derivatives with terthiophene-vinylene conjugated side chains, TTV-PTs. Copolymer P2 shows a down-shifted HOMO energy level, enhanced solubility, and red-shifted absorption, as compared with P1; however, the bulky side chains significantly disrupt the coplanarity of thiophene rings in the polymer backbone and the ability to self-assemble into an ordered structure. The GIXRD measurements reveal that the original crystallinity of P1 can be recovered by simply inserting a few 2,1,3-benzothiadiazole units into the polythiophene main chain in P2 through a random copolymerization route to yield a terpolymer, P3, which possesses excellent crystallinity, thereby causing a three-fold increment in hole mobility. Furthermore, the P1/PC61BM, P2/PC61BM, and P3/PC61BM solar devices exhibit power conversion efficiencies of 3.89%, 1.52%, and 4.17%, respectively, under AM1.5G illumination with an intensity of 100 mW cm-2. © The Royal Society of Chemistry 2016. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/444690 | DOI: | 10.1039/c6ra11738d | SDG/關鍵字: | Chains; Hole mobility; Photovoltaic effects; Self assembly; 2 ,1 ,3-Benzothiadiazole; Electron-deficient units; Molecular engineering; Photovoltaic applications; Polythiophene derivatives; Power conversion efficiencies; Random copolymerization; Two Dimensional (2 D); Conjugated polymers |
顯示於: | 化學工程學系 |
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