Synthesis and Photovoltaic Performance of Low-Bandgap Polymers on the Basis of 9,9-Dialkyl-3,6-dialkyloxysilafluorene

摘要: A new series of polysilafluorene-type low-bandgap polymers containing 3, 6-dialkyloxy-9, 9-dialkylsilafluorene and 4, 7-di-2-thienyl-2, 1, 3-benzothiadiazole units has been synthesized. UV/vis absorption spectroscopy and grazing incident X-ray diffraction results showed that the alkoxy moiety on the silafluorene unit broadens the absorption band of the polymers because of its electron-donating property, enabling more efficient harvesting of photons from the solar spectrum. Furthermore, the silicon atoms of the polymers lead to a highly ordered …