In situ scanning tunneling microscopy characterization of thienothiophene-based semiconducting organic molecules adsorbed on a Au(111) electrode

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100776

Title:	In situ scanning tunneling microscopy characterization of thienothiophene-based semiconducting organic molecules adsorbed on a Au(111) electrode
Authors:	陳銘洲;Luo, Shu Rong;Chen, Sih Zih;Hsu, Ya Hua;Yau, Shueh Lin;Lin, Yu-Jou;Huang, Peng-Yi;Chen, Ming-Chou
Contributors:	理學院化學學系
Keywords:	Adsorption;Anions;Au electrified interface;Charge injection;Condensed matter: electronic structure, electrical, magnetic, and optical properties;Condensed matter: structure, mechanical and thermal properties;Cross-disciplinary physics: materials science;rheology;Electrodes;Exact sciences and technology;In situ STM;Lamella;Molecular adsorption;Order disorder;Physics;Potential-induced ordering;Scanning tunneling microscopy;Surface chemistry;Thienothiophene
Date:	2013-10-01
Issue Date:	2026-04-21 14:13:40 (UTC+8)
Publisher:	Elsevier;Kidlington: Elsevier B.V
Abstract:	摘要： Organic molecules with a thienothiophene core are promising candidates for use in the fabrication of organic thin film transistors. In addition to the nature of the molecule, the adsorption orientation and spatial structure of admolecules at metal electrodes also affects the efficiency of charge injection at the molecule/metal interface. Scanning tunneling microscopy (STM), which is well-known for its sub-nanometer resolution, is particularly suitable in studying the structure of this interface. Dithieno[2,3-b:3,2-d]thiophene diphenyl (C6H5-DTT-C6H5) adsorbed on Au(111) electrode was previously examined. In this study we looked at molecules with perfluorophenyl substituents, 2-pentafluorophenyl-6-phenyldithieno[2,3-b:3′,2′-d]thiophene(C6F5-DTT-C6H5,1) and 2,6-bis(pentafluorophenyl)dithieno[3,2-b;2′,3′-d]thiophene(C6F5-DTT-C6F5, 2. In situ STM results obtained in 0.1M HClO4 showed that these molecules could be adsorbed in ordered adlattices on a Au(111) electrode from dosing solutions made of 50μM 1 or 2 in dicholobenzene. The adsorption strength of these molecules on Au(111) varied greatly with the electrochemical potential. They were mostly stable on Au(111) at 0.3V (vs. reversible hydrogen electrode), but could be displaced by water dipoles and perchlorate anions at E<0.2V and E>0.5V, respectively. It was possible to take advantage of this result to improve the degree of ordering by setting the potential at 0V briefly, then switching back to 0.3V. While 1 was adsorbed in a lamella structure as observed previously with C6H5-DTT-C6H5, 2 was arranged in a very different structure determined largely by the need to optimize the intermolecular interactions. •Thienothiophene-based molecules adsorbed on Au(111) were studied by in situ STM.•A proper potential program could increase molecular ordering.•Admolecules were arranged spatially to accommodate their dipole moments. 出版者： Kidlington: Elsevier B.V 出版日期： 2013-10-01 出處： Surface science, 2013-10, Vol.616, p.155-160 版權： 2013 Elsevier B.V. 版權： 2014 INIST-CNRS 識別號： ISSN: 0039-6028 識別號： EISSN: 1879-2758 識別號： DOI: 10.1016/j.susc.2013.05.013 識別號： CODEN: SUSCAS
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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