Enhancing the performance of solution-processed organic thin-film transistors by blending binary compatible small molecule semiconductors |
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| Affiliation: | 1. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, PR China;2. Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, PR China;1. Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 97401, Taiwan;2. Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan;1. Department of Physics and Electronics, Osaka Prefecture University, Sakai, 599-8531, Japan;2. The Research Institute for Molecular Electronic Devices, Osaka Prefecture University, Sakai, 599-8531, Japan;3. Center for Emergent Matter Science, RIKEN, Saitama, 351-0198, Japan;4. Department of Chemistry, Tohoku University, Sendai, 980-8578, Japan;5. R&D Planning Division, Nippon Kayaku Co., Ltd., Tokyo, 115-8588, Japan;1. Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University, Sakai, 599-8531, Japan;2. The Research Institute for Molecular Electronic Devices, Osaka Prefecture University, Sakai, 599-8531, Japan;3. RIKEN Center for Emergent Matter Science (CEMS), Saitama, 351-0198, Japan;4. Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan;5. R&D Planning Division, Nippon Kayaku Co., Ltd., Tokyo, 115-8588, Japan |
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| Abstract: | Physical blending is a facile and effective way to improve the performance of solution processed organic thin-film transistors (OTFTs). Blending small molecule semiconductors with soluble polymers has been extensively studied in recent years. However, blending between binary small molecule semiconductors is rare due to the difficulty to obtain ideal thin films. Herein, we systematically investigate the blending effects on the morphologies of thin films and their field-effect performance by using two small molecule semiconductors, 2-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT) and 2-(4-dodecylphenyl) [1]benzothieno[3,2-b]benzothiophene, (C12-Ph-BTBT), which have the same aromatic skeleton. Molecular ordering and better crystallinity are observed in most of spin-coated blend thin films, thanks to the enhanced molecular interaction after blending. As a result, OTFTs based on blend thin films exhibit improved performance in most cases, with the highest average hole mobility about 1.5 cm2 V−1 s−1 demonstrated. Further device performance improvements are demonstrated by blending polystyrene with Ph-BTBT and C12-Ph-BTBT blends. The results here indicate that blending between small molecule semiconductors with compatible fused ring structures may be a promising strategy to enhance the performance of organic transistors. |
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| Keywords: | Organic thin-film transistors Blend Small molecule semiconductor Molecular interaction |
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