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The polythiophene - based conductive polymer is a polymer solar cell hot research field , how to improve the mobility of holes in the absorption spectrum of the conjugated polymer and carrier rate is a key factor to improve the polymerization conversion efficiency of solar cells . Further, to improve the stability of the polymer in the air is also a necessary consideration . Design between the above factors , the angle of this thesis from the chemical structure of the polymer material , through the 3 - substituted polythiophene side chain functional groups of adjustment to improve the stability of the polymer in air , and through a band gap of the composite phase , the regulation of the method to improve the spectral response range, thereby enhancing the application of the material in the polymer solar cell . 1, by the method of exchanging with a Grignard reagent synthesized region regular poly ( 3 - hexyl thiophene ) , the proton NMR shows that the polymer has a 100% HT-HT structure , such a regular structure makes HT-HT polymerization has a good stability, and is not a material having high absorption spectrum than the tacticity redshift . 2 , the introduction of an ester group to the side chain , in the minus 40 ° C in a cryogenic protected , the successful synthesis of the side chain ester group-containing poly 3 - octyl thiophene . The polymer may also exhibit good HT-HT structure and thermal stability , due to the introduction of the ester group is an electron withdrawing group , which reduces the HOMO level of the material well . 3, based on the polyalkyl thiophene and polyester thienyl synthetic base , in order to further improve the stability of the material , to reduce the band gap of the material , the use of Pd (PPh3) 4 catalyzed Stille coupling reaction , synthesis with AB structure test analysis of the thiophene block copolymer - poly ( 3 - octyl thiophene thiophene - thiophene ) copolymer , TGA , UV - visible and other polymers have better stability , and the band gap decreased .
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