Understanding Interface Dipoles at an Electron Transport Material/Electrode Modifier for Organic Electronics
| Autor: | Xianjie Liu, Yongzhen Chen, Slawomir Braun, Mats Fahlman |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Organic electronics
molecular orientation Hydrogen bond hydrogen bond Materials science Interface dipole Materialkemi Electron Electrolyte interface dipole Molecular orientation Ion organic electronics Dipole Chemical physics Electrode Materials Chemistry General Materials Science electron transport material Physics::Atomic Physics Electron transport material Lone pair Ultraviolet photoelectron spectroscopy Research Article |
| Zdroj: | ACS Applied Materials & Interfaces |
| Popis: | Interface dipoles formed at an electrolyte/electrode interface have been widely studied and interpreted using the "double dipole step" model, where the dipole vector is determined by the size and/or range of motion of the charged ions. Some electron transport materials (ETMs) with lone pairs of electrons on heteroatoms exhibit a similar interfacial behavior. However, the origin of the dipoles in such materials has not yet been explored in great depth. Herein, we systematically investigate the influence of the lone pair of electrons on the interface dipole through three pyridine derivatives B2-B4PyMPM. Experiments show that different positions of nitrogen atoms in the three materials give rise to different hydrogen bonds and molecular orientations, thereby affecting the areal density and direction of the lone pair of electrons. The interface dipoles of the three materials predicted by the "double dipole step" model are in good agreement with the ultraviolet photoelectron spectroscopy results both in spin-coated and vacuum-deposited films. These findings help to better understand the ETMs/electrode interfacial behaviors and provide new guidelines for the molecular design of the interlayer. Funding agencies: The Swedish Research Council (project grants no. 2016-05498, 2016-05990, and 2020-04538), The Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO Mat LiU no. 2009 00971), The Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) |
| Databáze: | OpenAIRE |
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