Unveiling single-electron tunneling in nanogranular ultrathin films for sensor applications via hyperspectral conductive AFM
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2025-03-01
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Elsevier
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Resumen
This study maps the electrical behavior across a 7 × 7 μm2 nanogranular ultrathin Pd-ZrO2 film, revealing nonlinear I-V characteristics indicative of single-electron tunneling. Following the Coulomb blockade power law I ∼ (V − Vt)ξ with a scaling exponent ξ ≈ 1.2, these characteristics appear above the threshold voltage Vt. By modeling the nanogranular structure as a 1D array of multitunnel junctions, we demonstrate a linear relationship between Vt and tunnel channel length, allowing for a better understanding of nanoscale electrical properties and supporting the development of sensitive sensors
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We would like to thank Dr M. Febvre (Bruker) for his support with the sample measurements. M.D. acknowledged the support by the Spanish “Ministerio de Ciencia, Innovación y Universidades” under project EQC2018-004704-P
Citación
Hicham Bakkali, Manuel Dominguez, Unveiling single-electron tunneling in nanogranular ultrathin films for sensor applications via hyperspectral conductive AFM, Materials Letters, Volume 382, 2025, 137932, ISSN 0167-577X, https://doi.org/10.1016/j.matlet.2024.137932
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