Controlling Conformations of Diketopyrrolopyrrole-Based Conjugated Polymers: Role of Torsional Angle
Controlling Conformations of Diketopyrrolopyrrole-Based Conjugated Polymers: Role of Torsional Angle
复制标题
DOI：
10.1021/jp501526h
复制
发表时间：
2014-06-05
影响因子：
3.7
通讯作者：
Patil, Satish
中科院分区：
文献类型：
--
作者：
Kanimozhi, Catherine;Naik, Mallari;Patil, Satish
电荷载流子通过共轭聚合物的传输受到结构紊乱的存在和分布的强烈影响。在目前的工作中，结构缺陷所造成的扭转的存在。在二酮吡咯并吡咯（DPP）为基础的共轭聚合物的角度进行了研究。两种新的共聚物的DPP合成不同的扭转角跟踪结构无序的作用。这些共聚物在溶液和薄膜中的光学性质揭示了扭转角对其物理性质的强烈影响。在有机场效应晶体管（OFET）器件几何结构中，观察到了对聚合物载流子输运性质的强烈影响。与具有较低扭转角的基于噻吩DPP的聚合物（2DPP-OD-TEG）相比，具有较高扭转角的基于苯基DPP的聚合物（PPTDPP-OD-TEG）导致具有较小电荷载流子迁移率的高阈值电压。载流子迁移率和共轭聚合物的分子取向相关的掠入射X-射线散射测量的基础上，示出了强有力的作用的扭转角引入的结构紊乱的形式。在这篇文章中提出的结果提供了一个深刻的洞察结构无序的敏感性及其对器件性能的DPP为基础的共轭聚合物的影响。
Transport of charge carriers through conjugated polymers is strongly influenced by the presence and distribution of structural disorders. In the present work, structural defects caused by the presence of torsional.. angle were investigated in a diketopyrrolopyrrole (DPP)-based conjugated polymer. Two new copolymers of DPP were synthesized with varying torsional angles to trace the role of structural disorder. The optical properties of these copolymers in solution and thin film reveal the strong influence of torsional angle on their photophysical properties. A strong influence was observed on carrier transport properties of polymers in organic field-effect transistors (OFET) device geometry. The polymers based on phenyl DPP with higher torsional angle (PPTDPP-OD-TEG) resulted in high threshold voltage with less charge carrier mobility as compared to the polymer based on thiophene DPP (2DPP-OD-TEG) bearing a lower torsional angle. Carrier mobility and the molecular orientation of the conjugated polymers were correlated on the basis of grazing incidence X-ray scattering measurements showing the strong role of torsional angle introduced in the form of structural disorder. The results presented in this Article provide a deep insight into the sensitivity of structural disorder and its impact on the device performance of DPP-based conjugated polymers.