Interdisciplinary School of Green Energy, KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
J Am Chem Soc. 2013 Jun 26;135(25):9540-7. doi: 10.1021/ja403949g. Epub 2013 Jun 13.
Ambipolar polymer semiconductors are highly suited for use in flexible, printable, and large-area electronics as they exhibit both n-type (electron-transporting) and p-type (hole-transporting) operations within a single layer. This allows for cost-effective fabrication of complementary circuits with high noise immunity and operational stability. Currently, the performance of ambipolar polymer semiconductors lags behind that of their unipolar counterparts. Here, we report on the side-chain engineering of conjugated, alternating electron donor-acceptor (D-A) polymers using diketopyrrolopyrrole-selenophene copolymers with hybrid siloxane-solubilizing groups (PTDPPSe-Si) to enhance ambipolar performance. The alkyl spacer length of the hybrid side chains was systematically tuned to boost ambipolar performance. The optimized three-dimensional (3-D) charge transport of PTDPPSe-Si with pentyl spacers yielded unprecedentedly high hole and electron mobilities of 8.84 and 4.34 cm(2) V(-1) s(-1), respectively. These results provide guidelines for the molecular design of semiconducting polymers with hybrid side chains.
双极型聚合物半导体非常适合用于柔性、可打印和大面积电子领域，因为它们在单个层中表现出 n 型（电子传输）和 p 型（空穴传输）两种操作。这允许以具有高噪声容限和操作稳定性的成本效益方式制造互补电路。目前，双极型聚合物半导体的性能落后于其单极型对应物。在这里，我们报告了使用带有混合硅氧烷增溶基团的二酮吡咯并吡咯-硒吩共聚物（PTDPPSe-Si）对共轭交替电子给体-受体（D-A）聚合物进行侧链工程，以提高双极性能。系统地调节混合侧链的烷基间隔物长度以提高双极性能。具有戊基间隔物的 PTDPPSe-Si 的优化三维（3-D）电荷输运产生了前所未有的高空穴和电子迁移率，分别为 8.84 和 4.34 cm(2) V(-1) s(-1)。这些结果为具有混合侧链的半导体聚合物的分子设计提供了指导。
