Yu Yaping, Wu Yang, Zhang Andong, Li Cheng, Tang Zheng, Ma Wei, Wu Yonggang, Li Weiwei
College of Chemistry and Environmental Science, Hebei University , Baoding 071002, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 10090, China.
ACS Appl Mater Interfaces. 2016 Nov 9;8(44):30328-30335. doi: 10.1021/acsami.6b06967. Epub 2016 Oct 25.
Conjugated polymers consisting of diketopyrrolopyrrole (DPP) units have been successfully applied in field-effect transistors (FETs) and polymer solar cells (PSCs), while most of the DPP polymers were designed as symmetric structures containing identical aromatic linkers. In this manuscript, we design a new asymmetric DPP polymer with varied aromatic linkers in the backbone for application in FETs and PSCs. The designation provides the chance to finely adjust the energy levels of conjugated polymers so as to influence the device performance. The asymmetric polymer exhibits highly crystalline properties, high hole mobilities of 3.05 cm V s in FETs, and a high efficiency of 5.9% in PSCs with spectra response from 300 to 850 nm. Morphology investigation demonstrates that the asymmetric polymer has a large crystal domain in blended thin films, indicating that the solar cell performance can be further enhanced by optimizing the microphase separation. The study reveals that the asymmetric design via adjusting the aromatic linkers in DPP polymers is a useful route toward flexible electronic devices.
由二酮吡咯并吡咯（DPP）单元组成的共轭聚合物已成功应用于场效应晶体管（FET）和聚合物太阳能电池（PSC），然而大多数DPP聚合物被设计为含有相同芳族连接基的对称结构。在本论文中，我们设计了一种新型的不对称DPP聚合物，其主链中具有不同的芳族连接基，用于FET和PSC。这种设计提供了微调共轭聚合物能级的机会，从而影响器件性能。该不对称聚合物表现出高度结晶的特性，在FET中具有3.05 cm² V⁻¹ s⁻¹的高空穴迁移率，在光谱响应范围为300至850 nm的PSC中具有5.9%的高效率。形态学研究表明，该不对称聚合物在混合薄膜中具有大的晶域，这表明通过优化微相分离可以进一步提高太阳能电池性能。该研究表明，通过调整DPP聚合物中的芳族连接基进行不对称设计是通往柔性电子器件的一条有用途径。
