Germafluorenes: New Heterocycles for Plastic Electronics

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• 作者：Nicolas Allard ; Rda Badrou Ach ; David Gendron ; Pierre-Luc T. Boudreault ; Christian Tessier ; Salima Alem ; Shing-Chi Tse ; Ye Tao ; Mario Leclerc
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：March 9, 2010
• 年：2010
• 卷：43
• 期：5
• 页码：2328-2333
• 全文大小：860K
• 年卷期：v.43,no.5(March 9, 2010)
• ISSN：1520-5835

文摘

The synthesis and characterization of new heterofluorene derivatives based on germanium are described. These germafluorene monomers have been polymerized with different aromatic comonomers. The resulting homopolymers and alternating copolymers have been characterized by size exclusion chromatography, thermal analyses (TGA and DSC), UV−vis−NIR absorption spectroscopy, X-ray diffraction, and cyclic voltammetry. These homopolymers and copolymers are air-stable and present bandgaps ranging from 3.0 to 1.6 eV. Some copolymers were tested in field-effect transistors (FETs) and bulk heterojunction photovoltaic cells (PCs). Best results in FETs were obtained with poly[2,7-(9,9-di-n-butylgermafluorene)-alt-3,6-bis(thiophen-5-yl)-2,5-dioctylpyrrolo[3,4-]pyrrole-1,4-dione], which shows a hole mobility up to 0.04 cm² (V·s)⁻¹ with an I_on/I_off ratio of 1.0 × 10⁶. For photovoltaic applications, the best results were obtained with poly[2,7-(9,9-di-n-octylgermafluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] with a power conversion efficiency (PCE) of 2.8%.