characterized. Even a slight change in the length of the alkyl chain of the BTT units influences the steric bulk to such a degree that it substantially affects the molecular packing of the polymers and the performance of their photovoltaic devices. The bulkier side chains of the polymer PBTTBO‐C13C11 not only prevent its crystallization, but also suppress its light‐absorption coefficient relative to
两种交替的供体-受体共轭聚合物PB
TTBO-C 13 C 11和PB
TTBO-C 13 C 8,包含5-烷基苯并[1,2- b:3,4- b ':5,6- d - d '']三
噻吩(合成了B
TT)作为供体,合成了在其B
TT单元上具有不同烷基侧链结构的4,7-双(4-
十二烷基
噻吩-2-基)苯并[1,2,5]恶二唑(BO)作为受体,与
富勒烯PC 71混合时,它们的本体异质结光电性能BM具有特征。B
TT单元的烷基链的长度即使微小的变化也会影响空间体积,以至于其实质上影响聚合物的分子堆积及其光伏器件的性能。X射线衍射和UV / Vis吸收证明,聚合物PB
TTBO-C 13 C 11较大的侧链不仅阻止了其结晶,而且抑制了其相对于PB
TTBO-C 13 C 8的吸光系数。研究,大概是因为分子间的相互作用减弱了。此外,带有较大侧链的聚合物PB
TTBO-C 13 C 11与PC的溶混性较小。比PB
TTBO-C