https://scholars.lib.ntu.edu.tw/handle/123456789/611471
標題: | Excimer-Mediated Intermolecular Charge Transfer in Self-Assembled Donor-Acceptor Dyes on Metal Oxides | 作者: | Yu Y. Chien S.-C. Sun J. Hettiaratchy E.C. Myers R.C. Lin L.-C. Wu Y. LI-CHIANG LIN |
關鍵字: | Charge transfer;Electron transitions;Infrared devices;Light absorption;Metals;Molecular dynamics;Donor-acceptor molecules;Interfacial electron transfer dynamics;Intermolecular charge transfer;Metal oxide surfaces;Molecular dynamics simulations;Near-infrared absorption;Optoelectronics devices;Photoelectrochemicals;Molecules;chemical compound;dye;metal oxide;oligothiophene;perylenemonoimide;thiophene;triphenylamine;unclassified drug;Article;complex formation;electron transport;luminescence;molecular docking;near infrared spectroscopy;particle size;simulation;structure analysis;ultraviolet visible spectroscopy | 公開日期: | 2019 | 卷: | 141 | 期: | 22 | 起(迄)頁: | 8727-8731 | 來源出版物: | Journal of the American Chemical Society | 摘要: | When conjugate molecules are self-assembled on the surface of semiconductors, emergent properties resulting from the electronic coupling between the conjugate moieties are of importance in the interfacial electron-transfer dynamics for photoelectrochemical and optoelectronics devices. In this work, we investigate the self-assembly of triphenylamine-oligothiophene-perylenemonoimide (PMI) molecules, denoted as BH4, on metal oxide surfaces via UV-vis absorption, photoluminescence, and transient near-infrared absorption spectroscopies and molecular dynamics simulations, and we report the excimer formation due to the π-πinteraction of the PMI units between the neighboring dye molecules. To our best knowledge, this is the first experimental observation of intermolecular excimer formation when conjugate donor-acceptor molecules form a self-assembled monolayer. In addition, a long-lived (4.3 μs) intermolecular charge separation is observed, and a new excimer-mediated intermolecular charger-transfer mechanism is proposed. This work demonstrates that, through the design of dye molecules, the excited complexes or aggregates can provide a pathway to slow down the recombination rate in photoelectrodes that utilize donor-acceptor dyad molecules. ? 2019 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066836707&doi=10.1021%2fjacs.9b03729&partnerID=40&md5=95db805ba2bc4b3a6d358dbd3241e6ea https://scholars.lib.ntu.edu.tw/handle/123456789/611471 |
DOI: | 10.1021/jacs.9b03729 |
顯示於: | 化學工程學系 |
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