Enhancing Molecular Alignment and Charge Transport of Solution-Sheared Semiconducting Polymer Films by the Electrical-Blade Effect

被引:31
作者
Molina-Lopez, Francisco [1 ]
Wu, Hung-Chin [1 ]
Wang, Ging-Ji Nathan [1 ]
Yan, Hongping [1 ,2 ]
Shaw, Leo [1 ]
Xu, Jie [1 ]
Toney, Michael F. [2 ]
Bao, Zhenan [1 ]
机构
[1] Stanford Univ, Dept Chem Engn, 443 Via Ortega, Stanford, CA 94305 USA
[2] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA
基金
美国国家科学基金会; 瑞士国家科学基金会;
关键词
conjugated polymers; organic field effect transistors; organic semiconductors; polymer chain alignment; solution-shearing; FIELD-EFFECT TRANSISTORS; HIGH-MOBILITY; CONJUGATED POLYMERS; PHOTOVOLTAIC CELLS; THIN-FILMS; CRYSTALLIZATION; AGGREGATION; ANISOTROPY; NANOWIRES; COPOLYMER;
D O I
10.1002/aelm.201800110
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Controlling polymer chain alignment through processing is a means of tuning the charge transport of solution-based conjugated polymers. In this work, a processing strategy is proposed in which an external electric field (E-field) is applied to the coating blade (E-blade) to align polymer chain during solution-shearing, a meniscus-guided coating technique. A theoretical model based on dielectrophoresis quantitatively describes and predicts the alignment process and is used to guide the selection of the optimal conditions of the applied E-field. Using these conditions, more than twofold increase in chain alignment is observed for E-bladed thin films of a diketopyrrolopyrrole (DPP) semiconducting polymer without affecting other morphological aspects such as film thickness, film coverage, or fiber-like aggregation. Organic field effect transistors based on the E-bladed DPP polymer are fabricated at ambient conditions and over areas of a few cm(2). They display a threefold improvement in their mobilities and a strong enhancement in charge transport anisotropy compared to films prepared without E-field. These results reveal a synergistic alignment effect from both the solution-shearing process and the applied E-field, and introduce a novel and general approach to control the morphology and the electrical properties of solution-coated conjugated polymer thin films.
引用
收藏
页数:12
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