https://scholars.lib.ntu.edu.tw/handle/123456789/630152
標題: | Solution-Processed Isoindigo- and Thienoisoindigo-Based Donor-Acceptor-Donor π-Conjugated Small Molecules: Synthesis, Morphology, Molecular Packing, and Field-Effect Transistor Characterization | 作者: | Liao, Yu Ting Hsiao, Yi Chun Lo, Yuan Chih CHIA-CHI LIN Lin, Po Shen SHIH-HUANG TUNG KEN-TSUNG WONG CHENG-LIANG LIU |
關鍵字: | donor-acceptor-donor | isoindigo | organic transistor | thienoisoindigo | triarylamine | 公開日期: | 21-十二月-2022 | 出版社: | AMER CHEMICAL SOC | 卷: | 14 | 期: | 50 | 起(迄)頁: | 55886 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | Molecular design and precise control of thin-film morphology and crystallinity of solution-processed small molecules are important for enhancing charge transport mobility of organic field-effect transistors and gaining more insight into the structure-property relationship. Here, two donor-acceptor-donor (D-A-D) architecture small molecules TRA-IID-TRA and TRA-TIID-TRA comprising an electron-donating triarylamine (TRA) and two different electron-withdrawing cores, isoindigo (IID) and thienoisoindigo (TIID), respectively, were synthesized and characterized. Replacing the phenylene rings of central IID A with thiophene gives a TIID core, which reduces the optical band gap and upshifts the energy levels of frontier molecular orbitals. The single-crystal structures and grazing-incidence wide-angle X-ray scattering (GIWAXS) analysis revealed that TRA-TIID-TRA exhibits the relatively tighter π-πstacking packing with preferential edge-on orientation, larger coherence length, and higher crystallinity due to the noncovalent S···O/S···πintermolecular interactions. The distinctly oriented and connected ribbon-like TRA-TIID-TRA crystalline film by the solution-shearing process achieved a superior hole mobility of 0.89 cm2V-1s-1in the organic field-effect transistor (OFET) device, which is at least five times higher than that (0.17 cm2V-1s-1) of TRA-IID-TRA with clear cracks. Eventually, rational modulation of fused core in the π-conjugated D-A-D small molecule provides a new understanding of structural design for enhancing the performance of solution-processed organic semiconductors. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630152 | ISSN: | 19448244 | DOI: | 10.1021/acsami.2c18049 |
顯示於: | 高分子科學與工程學研究所 |
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