Photon assisted-inversion of majority charge carriers in molecular semiconductor-based organic heterojunctions
| Autor: | Alix Deshotel, Marcel Bouvet, Rita Meunier-Prest, Gracia Loma Kikobo, Seydou Ouedraogo, Vaibhav Vibhu, Mickaël Mateos, Abhishek Kumar |
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| Přispěvatelé: | Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon] (ICMUB), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Ambipolar diffusion Heterojunction 02 engineering and technology General Chemistry Electron 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Surface energy 0104 chemical sciences Dielectric spectroscopy Materials Chemistry Optoelectronics [CHIM]Chemical Sciences Charge carrier ddc:530 Thin film 0210 nano-technology business Visible spectrum |
| Zdroj: | Journal of materials chemistry / C 9(14), 5008-5020 (2021). doi:10.1039/D0TC05828A Journal of Materials Chemistry C Journal of Materials Chemistry C, Royal Society of Chemistry, 2021, 9 (14), pp.5008-5020. ⟨10.1039/d0tc05828a⟩ |
| ISSN: | 2050-7526 2050-7534 |
| DOI: | 10.1039/D0TC05828A |
| Popis: | International audience; Ambipolar molecular materials hold great promises as a building block of next generation highly efficient, less complex and low cost electronics devices. In this endeavor, the present work reports the fabrication of organic heterojunction devices based on halogenated copper Phthalocyanines (CuPc) and lutetium bisphthalocyanine (LuPc2) bilayer, investigates their structural and electrical properties and probes the ambipolar behavior by ammonia sensing. Microstructural analysis of the heterostructure thin films revealed compact and semicrystalline organization, depending on the number of halogen substituents in CuPc. The heterojunction devices reveal a non-linear I(V) characteristics associated with interfacial energy barrier which is tuned by the number and type of halogen substituents. The devices behavior towards NH3 exposure revealed n-type, p-type and ambipolar transport depending on 16, 0 and 8 fluorine substituents, respectively present in CuPc component of the heterostructure, demonstrating a correlation between electronic effects of substituents to the thin film electrical properties. The trigger of ambipolar transport regime in the heterojunction device is the visible light, such that device conduction channel is dominated by holes in the dark and electrons under illumination. In depth charge transport studies by impedance spectroscopy explains the device electrical behavior and highlights the important role played by the interface in the heterostructures. Different charge transport parameters are extracted by fitting of the experimental Nyquist curves, analysis of those confirm the presence of bulk and interfacial transport and provides an interpretation of the observed ambipolarity. |
| Databáze: | OpenAIRE |
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