High Field‐Effect Mobilities for Diblock Copolymers of Poly(3‐hexylthiophene) and Poly(methyl acrylate)
High Field‐Effect Mobilities for Diblock Copolymers of Poly(3‐hexylthiophene) and Poly(methyl acrylate)
复制标题
DOI：
10.1002/adma.200602368
复制
发表时间：
2007-07
影响因子：
29.4
通讯作者：
G. Sauvé;R. D. Mccullough
中科院分区：
文献类型：
--
作者：
G. Sauvé;R. D. Mccullough
有机半导体在薄膜晶体管中的应用前景广阔，应用范围从平板显示器的驱动器到智能卡和电子识别标签。[1，2]特别是，可溶液处理的有机半导体使使用现有的印刷技术制造大面积薄膜变得容易且成本效益高。[3-6]由于其高空穴迁移率[7-12]和易于合成，[13-15]区域规整聚(3-己基噻吩基)(rr-P3HT)是最有前途和最受研究的溶液可加工材料之一。为了进一步改善rr-P3HT的性能，我们一直在开发新型的rr-P3HT嵌段共聚物。[16，17]通过改变非共轭链段，可以微调用于各种器件应用的共聚物的物理和电学性能。为了评估我们的嵌段共聚物的电学性能，我们以前使用四点探针法测量了碘掺杂薄膜的电导率。[16，17]这种方法在宏观尺度上探测聚合物在块体中的导电性。通过这种方法，我们发现rr-P3HT嵌段共聚物具有较高的电导率，尽管有绝缘嵌段的存在。[16，17]根据这些嵌段共聚物自组装成被绝缘聚合物链段包围的rr-P3HT导电纳米纤维的趋势来解释这些结果。当成分以绝缘的非晶态第二块为主时，电导值趋于较低，这是可以预期的，因为非导电块“稀释了薄膜的电流密度”。在这里，我们对这个主题进行详细说明，并对块进行评估
The use of organic semiconductors in thin-film transistors holds great promise, with applications ranging from drivers for flat-panel displays to smart cards and electronic identification tags. [1,2] In particular, solution-processable organic semi-conductors make it easy and cost-effective to fabricate large-area thin films using established printing technologies. [3–6] Because of its high hole mobility [7–12] and ease of synthesis, [13–15] regioregular poly(3-hexylthiophene) (rr-P3HT) is one of the most promising and most studied solution-processable materials. To further improve the properties of rr-P3HT, we have been developing novel block copolymers of rr-P3HT. [16,17] By varying the nonconjugated segment it is possible to fine-tune the physical and electrical properties of the copolymer for various device applications. To assess the electrical properties of our block copolymers we previously measured conductivities of iodine-doped films using the 4-point probe method. [16,17] This method probes the conductivity of the polymer in the bulk on the macroscale. By this method, we showed that block copolymers of rr-P3HT have relatively high conductivities, despite the presence of the insulating block. [16,17] These results were explained in terms of the tendency of these block co-polymers to self-assemble into conducting nanofibrils of rr-P3HT that are surrounded by the insulating polymer segment. The conductivity values tended to become lower when the composition is dominated by the insulating, amorphous second block, as would be expected because the nonconduct-ing block “dilutes’ the current density of the film. Here, we elaborate on this topic and evaluate the block