Discovery and structure characteristics of the intermediate-state conformation of poly(9,9-dioctylfluorene) (PFO) in the dynamic process of conformation transformation and its effects on carrier mobility.
Discovery and structure characteristics of the intermediate-state conformation of poly(9,9-dioctylfluorene) (PFO) in the dynamic process of conformation transformation and its effects on carrier mobility.
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DOI：
10.1039/c9ra07115f
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发表时间：
2019-12-20
期刊：
影响因子：
3.9
通讯作者：
Lu, Dan
中科院分区：
文献类型：
--
作者：
Liu, Bin;Bai, Zeming;Li, Tao;Liu, Yang;Li, Xiaona;Zhang, Hao;Lu, Dan
良好的溶液加工性能是制造聚合物光电器件的先决条件。本研究通过紫外可见吸收光谱、光致发光光谱（PL）和拉曼光谱，在α构象向β构象的转变过程中发现了一种新的PFO链构象，称为“中间态构象”。中间态构象不仅弥补了β构象大量聚集造成的成膜缺陷，而且获得了与β构象相当的载流子迁移率。同时发现，与β构象的薄膜相比，中间态构象的薄膜具有光滑的表面形貌，这表明中间态构象具有良好的溶液加工性能；因此更适合制备高载流子迁移率的光电薄膜。高分辨率透射电子显微镜（HR-TEM）测量结果表明，中间态构象和β构象薄膜中存在明显的晶格条纹；这表明中间态构象比β构象具有更平坦的构象和更长的共轭长度，这非常有利于增强载流子迁移率。该研究基于共轭聚合物物理，显着揭示了聚合物结构的动态演化。该结论丰富了对共轭聚合物结构演化和动态过程的理解，由于中间态构象良好的成膜性能，在光电和其他功能器件方面呈现出广阔的应用前景。良好的溶液加工性能是制造聚合物光电器件的先决条件。
Good solution processability is a prerequisite for fabricating polymer optoelectronic devices. In this research, a new PFO chain conformation called “intermediate-state conformation” was found through UV-vis absorption spectroscopy, photoluminescence spectroscopy (PL) and Raman spectroscopy in the transition process of α conformation towards β conformation. The intermediate-state conformation not only remedies the defect of film-forming caused by large aggregation of β-conformation but also gains an equivalent carrier mobility similar to that of β conformation. Simultaneously, it was found that the film with the intermediate-state conformation had a smooth surface morphology compared to the film with β-conformation, which indicates that the intermediate-state conformation has good solution processability; thus, it is more suitable for the fabrication of photoelectric films with high carrier mobility. The results of high-resolution transmission electron microscopy (HR-TEM) measurements showed that there were obvious lattice fringes in the films with the intermediate-state conformation and β conformation; this reveals that the intermediate-state conformation has a more planar conformation with extended conjugation length than the β conformation, which is very beneficial to enhance carrier mobility. The research significantly reveals the dynamic evolution of polymer structures based on conjugated polymer physics. The conclusions enrich the understanding of the structure evolution and dynamic process of conjugated polymers and present broad application prospects for photoelectric and other functional devices due to the good film-forming properties of the intermediate-state conformation. Good solution processability is a prerequisite for fabricating polymer optoelectronic devices.
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