Germafluorenes: New Heterocycles for Plastic Electronics
2010; American Chemical Society; Volume: 43; Issue: 5 Linguagem: Inglês
10.1021/ma9025866
ISSN1520-5835
AutoresNicolas Allard, R. Aïch, David Gendron, Pierre‐Luc T. Boudreault, Christian Tessier, Salima Alem, Shing-Chi Tse, Ye Tao, Mario Leclerc,
Tópico(s)Semiconductor materials and interfaces
ResumoThe 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 Ion/Ioff 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%.
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