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One polythiophene derivative PT3T and two low band gap copolymers,PBTT-T3T and PBTT,with different ratios of 5,6-dini-trobenzothiadiazole as the acceptor unit in the polymer backbone have been synthesized by Pd-catalyzed Stille-coupling polymerizations.Thermal stability,X-ray diffraction analyses,UV-vis absorption spectra,photoluminescence spectra and electrochemical properties of the copolymers were investigated.The band gap estimated from UV-vis-NIR spectra of the copolymers films varied from 1.39 to 1.94 eV.Among these copolymers,the films of PBTT-T3T and PBTT,which contain the 5,6-dinitrobenzothiadiazole unit,cover a broad wavelength range in the visible and near-infrared region from 400 to 1000 nm with the maximal peak absorption around 700 nm,which is exactly matched with the maximum in the photon flux of the sun.
One polythiophene derivative PT3T and two low band gap copolymers, PBTT-T3T and PBTT, with different ratios of 5,6-dini-trobenzothiadiazole as the acceptor unit in the polymer backbone have been synthesized by Pd-catalyzed Stille-coupling polymerizations. , X-ray diffraction analyzes, photoluminescence spectra and electrochemical properties of the copolymers were investigated. The band gap estimated from UV-vis-NIR spectra of the copolymer films varied from 1.39 to 1.94 eV. Ammong these copolymers, the films of PBTT-T3T and PBTT, which contain the 5,6-dinitrobenzothiadiazole unit, cover a broad wavelength range in the visible and near-infrared region from 400 to 1000 nm with the maximal peak absorption around 700 nm, which is exactly matched with the maximum in the photon flux of the sun.