Assessing the electrical activity of individual ZnO nanowires thermally annealed in air
In: ISSN: 2516-0230 ; Nanoscale Advances ; https://hal.science/hal-03604085 ; Nanoscale Advances, 2022, 2022
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International audience ; ZnO nanowires (NWs) are very attractive for a wide range of nanotechnological applications owing to their tunable electron concentration via structural and surface defect engineering. A 2D electrical profiling of these defects is necessary to understand their restructuring dynamics during engineering processes. Our work proposes the exploration of individual ZnO NWs, dispersed on a SiO2/p++-Si substrate without any embedding matrix, along their axial direction using scanning capacitance microscopy (SCM), which is a useful tool for 2D carrier profiling. ZnO NWs are hydrothermally grown using 0-20 mM ammonium hydroxide (NH4OH), one of the reactants of the hydrothermal synthesis, and then annealed in a tube oven at 350 °C/1.5-15 h and 450 °C/15 h. While the as-grown ZnO NWs are highly conductive, the annealed ones exhibit significant SCM data with a high signal-to-noise ratio and temperature-dependent uniformity. The SCM signal of ZnO NWs is influenced by both their reduced dimensionality and the electron screening degree inside them. The electrical activity of ZnO NWs is only observed below a critical defect concentration that depends on the annealing temperature. Optimal SCM signals of 200 and 147 mV are obtained for samples with 0 and 20 mM NH4OH, respectively, and annealed at 350 °C/15 h. The corresponding electron concentrations of 3.27 × 1018 and 4.58 × 1018 cm−3 were estimated from the calibration curve, respectively. While thermal treatment in air of ZnO NWs is an effective approach to tune the defect density, 2D electrical mapping enables identifying their optimal electrical characteristics, which could help to boost the performance of final devices exploiting their coupled semiconducting-piezoelectric properties.
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Assessing the electrical activity of individual ZnO nanowires thermally annealed in air
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Autor/in / Beteiligte Person: | Bah, Micka ; Tlemcani, T. ; Boubenia, Sarah ; Justeau, Camille ; Vivet, Nicolas ; Chauveau, Jean Michel ; Jomard, François ; Nadaud, Kevin ; Poulin-Vittrant, Guylaine ; Alquier, Daniel ; GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347) ; Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL) ; Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) ; STMicroelectronics Tours (ST-TOURS) ; Groupe d'Etude de la Matière Condensée (GEMAC) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS) ; Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA) ; 692482, H2020/2014-2020 ; European Commission, EC: 6655107 ; This research was funded by the EnSO project through the electronic components and systems for European leadership joint undertaking in collaboration with the European Union?s H2020 framework programme (H2020/2014-2020) and national authorities (grant agreement number 692482). This work was also funded by the EU commission under the H2020 FET-OPEN program ; project ?ZOTERAC? FET-OPEN 6655107. The authors thank V. Sallet (GEMAC) for SIMS measurements and D. Lefebvre (CRHEA) for technical contribution to MBE growth. |
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Zeitschrift: | ISSN: 2516-0230 ; Nanoscale Advances ; https://hal.science/hal-03604085 ; Nanoscale Advances, 2022, 2022 |
Veröffentlichung: | HAL CCSD ; RSC, 2022 |
Medientyp: | academicJournal |
DOI: | 10.1039/d1na00860a |
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