Selective photocurrent generation in HfO2 and carbon nanotube hybrid nanocomposites under Ultra-Violet and visible photoexcitations
| Autor: | Erwan Rauwel, Protima Rauwel, Augustinas Galeckas, F. Ducroquet |
|---|---|
| Přispěvatelé: | Tallinn University of Technology, Tartu College, Estonian University of Life Sciences (EMU), University of Oslo (UiO), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Estonian University of Life Science, EQUITANT, FUNDAMENT |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Nanotube
Materials science Band gap Carbon nanotubes Nanoparticle 02 engineering and technology Carbon nanotube 010402 general chemistry 7. Clean energy 01 natural sciences law.invention law Photocurrent General Materials Science surface states [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics HfO2 Surface states PhotocurrentHfO2nanoparticlesCarbon nanotubeshybrid nanocompositessurface states Nanocomposite hybrid nanocomposites business.industry Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Photoexcitation Mechanics of Materials Optoelectronics nanoparticles 0210 nano-technology business |
| Zdroj: | Materials Letters Materials Letters, Elsevier, 2019, ⟨10.1016/j.matlet.2019.03.030⟩ |
| ISSN: | 0167-577X |
| Popis: | International audience; We report on the photocurrent generation in HfO2-carbon nanotube (CNT) nanocomposites under Ultra-Violet (UV) and visible excitations at zero bias. Cubic phase HfO2 nanoparticles have been combined with multi-walled carbon nanotubes in this work. The cubic phase of HfO2 has been stabilized by oxygen vacancies which act as luminescent band gap states. In a broad UV-visible range of below band gap photoexcitation, a photocurrent is generated which was found to be most efficient under UV illumination. We discuss the possible mechanism in terms of a CNT assisted charge transfer involving optically active surface states of the HfO2 nanoparticles. The abrupt generation and relaxation responses of the photocurrent on/off cycles along with a constant steady state current as high as 200nA for 1mg of the nanocomposite, has potential in energy harvesting and other applications requiring stable charge retention. |
| Databáze: | OpenAIRE |
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