Effect of the Substitution Pattern of Alkyl Side Chain in a Benzodithiophene Core π-System on Intra and Inter-Molecular Charge Carrier Mobility
作者:Jun Kumagai、Koji Hirano、Tetsuya Satoh、Shu Seki、Masahiro Miura
DOI:10.1021/jp2036668
日期:2011.7.7
conjugation of cross-shaped 2 is well reflected in the intramolecular mobility of positive holes estimated by FP-TRMC, showing striking contrast to the rather higher mobility of X-shaped 1 observed by FET as well as TOF measurements as the long-range translational motion of the carriers. This strongly suggests that the intermolecular packing of these compounds plays a significant role in the range of hole mobility
3,7- Didocecyl -2,6-二(5-苯基噻吩-2-基)苯并[1,2- b:3,4- B' ]二噻吩(1)和它的4,8-双十二烷基异构体2制备作为代表性的可溶的X形和十字形π共轭低聚物体系,可深入了解烷基侧链的取代方式对电子性能的影响。吸收光谱和发射光谱以及CV数据显示十字形2的相对较长的有效共轭。然后通过快速光解时间分辨微波电导率(FP-TRMC)方法估算了固有的载流子迁移率,并与它们的顶部接触FET特性进行了比较。结果发现,尽管TRMC方法显示出2的较高迁移率大于1,的FET性能1后适当的调节和热退火明显优于的2。十字形2的有效共轭很好地反映在FP-TRMC估计的空穴的分子内迁移率中,这与FET以及长距离TOF测量所观察到的X形1的较高迁移率形成了鲜明的对比。载体的平移运动。这强烈表明,这些化合物的分子间堆积在<〜10 –2 cm 2 V –1 s –1的空穴迁移率范围内起着重要作用。