Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene
The structural and electronic properties of interfaces composed of donor and acceptor molecules play important roles in the development of organic opto-electronic devices. Epitaxial growth of organic semiconductor molecules offers a possibility to control the interfacial structures and to explore pr...
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doaj-55f53e26783248baa9c5a199e21dc8512021-02-27T00:02:48ZengMDPI AGMaterials1996-19442021-02-01141088108810.3390/ma14051088Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal PentaceneYuki Gunjo0Hajime Kamebuchi1Ryohei Tsuruta2Masaki Iwashita3Kana Takahashi4Riku Takeuchi5Kaname Kanai6Tomoyuki Koganezawa7Kazuhiko Mase8Makoto Tadokoro9Yasuo Nakayama10Department of Pure and Applied Chemistry, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanDepartment of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanDepartment of Pure and Applied Chemistry, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanDepartment of Pure and Applied Chemistry, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanDepartment of Pure and Applied Chemistry, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanDepartment of Pure and Applied Chemistry, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanDepartment of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanIndustrial Application Division, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, JapanInstitute for Materials Structure Science, High Energy Accelerator Research Organization (KEK) and SOKENDAI, 1-1 Oho, Tsukuba, Ibaraki 305-0801, JapanDepartment of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanDepartment of Pure and Applied Chemistry, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, JapanThe structural and electronic properties of interfaces composed of donor and acceptor molecules play important roles in the development of organic opto-electronic devices. Epitaxial growth of organic semiconductor molecules offers a possibility to control the interfacial structures and to explore precise properties at the intermolecular contacts. 5,6,11,12-tetraazanaphthacene (TANC) is an acceptor molecule with a molecular structure similar to that of pentacene, a representative donor material, and thus, good compatibility with pentacene is expected. In this study, the physicochemical properties of the molecular interface between TANC and pentacene single crystal (PnSC) substrates were analyzed by atomic force microscopy, grazing-incidence X-ray diffraction (GIXD), and photoelectron spectroscopy. GIXD revealed that TANC molecules assemble into epitaxial overlayers of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>(</mo><mrow><mn>010</mn></mrow><mo>)</mo></mrow></mrow></semantics></math></inline-formula> oriented crystallites by aligning an axis where the side edges of the molecules face each other along the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>[</mo><mrow><mover accent="true"><mn>1</mn><mo>¯</mo></mover><mn>10</mn></mrow><mo>]</mo></mrow></mrow></semantics></math></inline-formula> direction of the PnSC. No apparent interface dipole was found, and the energy level offset between the highest occupied molecular orbitals of TANC and the PnSC was determined to be 1.75 eV, which led to a charge transfer gap width of 0.7 eV at the interface.https://www.mdpi.com/1996-1944/14/5/1088organic semiconductordonor-acceptor interfacep-n junctionheteroepitaxygrazing-incidence wide-angle X-ray scatteringphotoemission |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yuki Gunjo Hajime Kamebuchi Ryohei Tsuruta Masaki Iwashita Kana Takahashi Riku Takeuchi Kaname Kanai Tomoyuki Koganezawa Kazuhiko Mase Makoto Tadokoro Yasuo Nakayama |
spellingShingle |
Yuki Gunjo Hajime Kamebuchi Ryohei Tsuruta Masaki Iwashita Kana Takahashi Riku Takeuchi Kaname Kanai Tomoyuki Koganezawa Kazuhiko Mase Makoto Tadokoro Yasuo Nakayama Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene Materials organic semiconductor donor-acceptor interface p-n junction heteroepitaxy grazing-incidence wide-angle X-ray scattering photoemission |
author_facet |
Yuki Gunjo Hajime Kamebuchi Ryohei Tsuruta Masaki Iwashita Kana Takahashi Riku Takeuchi Kaname Kanai Tomoyuki Koganezawa Kazuhiko Mase Makoto Tadokoro Yasuo Nakayama |
author_sort |
Yuki Gunjo |
title |
Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene |
title_short |
Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene |
title_full |
Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene |
title_fullStr |
Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene |
title_full_unstemmed |
Interface Structures and Electronic States of Epitaxial Tetraazanaphthacene on Single-Crystal Pentacene |
title_sort |
interface structures and electronic states of epitaxial tetraazanaphthacene on single-crystal pentacene |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-02-01 |
description |
The structural and electronic properties of interfaces composed of donor and acceptor molecules play important roles in the development of organic opto-electronic devices. Epitaxial growth of organic semiconductor molecules offers a possibility to control the interfacial structures and to explore precise properties at the intermolecular contacts. 5,6,11,12-tetraazanaphthacene (TANC) is an acceptor molecule with a molecular structure similar to that of pentacene, a representative donor material, and thus, good compatibility with pentacene is expected. In this study, the physicochemical properties of the molecular interface between TANC and pentacene single crystal (PnSC) substrates were analyzed by atomic force microscopy, grazing-incidence X-ray diffraction (GIXD), and photoelectron spectroscopy. GIXD revealed that TANC molecules assemble into epitaxial overlayers of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>(</mo><mrow><mn>010</mn></mrow><mo>)</mo></mrow></mrow></semantics></math></inline-formula> oriented crystallites by aligning an axis where the side edges of the molecules face each other along the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>[</mo><mrow><mover accent="true"><mn>1</mn><mo>¯</mo></mover><mn>10</mn></mrow><mo>]</mo></mrow></mrow></semantics></math></inline-formula> direction of the PnSC. No apparent interface dipole was found, and the energy level offset between the highest occupied molecular orbitals of TANC and the PnSC was determined to be 1.75 eV, which led to a charge transfer gap width of 0.7 eV at the interface. |
topic |
organic semiconductor donor-acceptor interface p-n junction heteroepitaxy grazing-incidence wide-angle X-ray scattering photoemission |
url |
https://www.mdpi.com/1996-1944/14/5/1088 |
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