In-Depth Investigation of the Correlation between Organic Semiconductor Orientation and Energy-Level Alignment Using In Situ Photoelectron Spectroscopy
| Autor: | Jeong-Il Park, Joo-Young Kim, JaeGwan Chung, Yongsu Kim, Jong Won Chung, Youngjun Yun, Sung Heo, Young-Nam Kwon, Jiyoul Lee, Seong Heon Kim, Dong-Jin Yun, Ki-Hong Kim |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry 02 engineering and technology Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Pentacene Organic semiconductor chemistry.chemical_compound Semiconductor X-ray photoelectron spectroscopy chemistry PEDOT:PSS Thiophene Physical chemistry General Materials Science 0210 nano-technology business Ultraviolet photoelectron spectroscopy |
| Zdroj: | ACS Applied Materials & Interfaces. 12:50628-50637 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c09602 |
| Popis: | Organic semiconductors (OSCs) are of interest for replacing traditional Si-based semiconductors as their flexibility and transparency enable new applications. The properties of OSC materials greatly depend on their orientation and molecular arrangement, which are strongly dependent on the underlying substrate material. Hence, in this study, in situ ultraviolet photoelectron spectroscopy (UPS) is used to elucidate the effect of the substrate on OSC orientation. Two types of OSCs, namely those with shape anisotropy (pentacene, dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene, and dibenzothiopheno[6,5-b:6',5'-f]thieno[3,2-b]thiophene) and those with shape isotropy (N,N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine, tris(4-carbazoyl-9-ylphenyl)amine, and [6,6]-phenyl C71 butyric acid methyl ester), are deposited on different electrode materials. The differences in the UPS spectra of these materials are observed directly. In general, the orientation of anisotropic OSC molecules significantly depends on the substrate properties, while that of the isotropic ones do not. All the anisotropic OSC molecules grown on poly(3,4-ethylenedioxythiophene)-polystyrenesulfonate (PEDOT:PSS) electrodes show a greater degree of molecular ordering than those grown on Au and multiwalled carbon nanotube/PEDOT:PSS electrodes. The molecular arrangements within the OSC/electrode structures are reflected in the energy-level shifts in the corresponding UPS spectra and hence in the electronic configurations. The results of this study should aid the design and synthesis of OSC materials with configurations suitable for organic electronic devices. |
| Databáze: | OpenAIRE |
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