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  1. Article ; Online: High Spatial Resolution Thermal Mapping of Volatile Switching in NbO

    Nandi, Sanjoy Kumar / Puyoo, Etienne / Nath, Shimul Kanti / Albertini, David / Baboux, Nicolas / Das, Sujan Kumar / Ratcliff, Thomas / Elliman, Robert G

    ACS applied materials & interfaces

    2022  Volume 14, Issue 25, Page(s) 29025–29031

    Abstract: Temperature mapping by in situ thermoreflectance thermal imaging (TRTI) or midwave infrared spectroscopy has played an important role in understanding the origins of threshold switching and the effect of insulator-metal transitions in oxide-based ... ...

    Abstract Temperature mapping by in situ thermoreflectance thermal imaging (TRTI) or midwave infrared spectroscopy has played an important role in understanding the origins of threshold switching and the effect of insulator-metal transitions in oxide-based memrsitive devices. In this study, we use scanning thermal microscopy (SThM) as an alternative thermal mapping technique that offers high spatial resolution imaging (∼100 nm) and is independent of material. Specifically, SThM is used to map the temperature distribution in NbO
    Language English
    Publishing date 2022-06-14
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.2c06870
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: High Spatial Resolution Thermal Mapping of Volatile Switching in NbOₓ-Based Memristor Using In Situ Scanning Thermal Microscopy

    Nandi, Sanjoy Kumar / Puyoo, Etienne / Nath, Shimul Kanti / Albertini, David / Baboux, Nicolas / Das, Sujan Kumar / Ratcliff, Thomas / Elliman, Robert G.

    ACS applied materials & interfaces. 2022 June 14, v. 14, no. 25

    2022  

    Abstract: Temperature mapping by in situ thermoreflectance thermal imaging (TRTI) or midwave infrared spectroscopy has played an important role in understanding the origins of threshold switching and the effect of insulator–metal transitions in oxide-based ... ...

    Abstract Temperature mapping by in situ thermoreflectance thermal imaging (TRTI) or midwave infrared spectroscopy has played an important role in understanding the origins of threshold switching and the effect of insulator–metal transitions in oxide-based memrsitive devices. In this study, we use scanning thermal microscopy (SThM) as an alternative thermal mapping technique that offers high spatial resolution imaging (∼100 nm) and is independent of material. Specifically, SThM is used to map the temperature distribution in NbOₓ-based cross-bar and nanovia devices with Pt top electrodes. The measurements on cross-bar devices reproduce the current redistribution and confinement processes previously observed by TRTI but without the need to coat the electrodes with a material of high thermo-reflectance coefficient (e.g., Au), while those on the nanovia devices highlight the spatial resolution of the technique. The measured temperature distributions are compared with those obtained from physics-based finite-element simulations and suggest that thermal boundary resistance plays an important role in heat transfer between the active device volume and the top electrode.
    Keywords electrodes ; heat transfer ; infrared spectroscopy ; temperature
    Language English
    Dates of publication 2022-0614
    Size p. 29025-29031.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.2c06870
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: High performance ZnO-SnO₂:F nanocomposite transparent electrodes for energy applications.

    Giusti, Gaël / Consonni, Vincent / Puyoo, Etienne / Bellet, Daniel

    ACS applied materials & interfaces

    2014  Volume 6, Issue 16, Page(s) 14096–14107

    Abstract: Enhancing the propagation length of light without sacrificing the electro-optical properties of transparent electrodes is of particular interest to solar cells for reaching higher efficiency. This can typically be achieved by nanostructured electrodes ... ...

    Abstract Enhancing the propagation length of light without sacrificing the electro-optical properties of transparent electrodes is of particular interest to solar cells for reaching higher efficiency. This can typically be achieved by nanostructured electrodes but all too often at the expense of complexity and cost-effectiveness. In this work, we demonstrate the simple and low-cost fabrication of a new type of ZnO-SnO2:F nanocomposite thin film by combining spin-coated ZnO nanoparticles on glass with fluorine-doped SnO2 thin films deposited by atmospheric spray pyrolysis. The resulting nanocomposites exhibit a dual surface morphology featuring rough ZnO-SnO2:F nanostructures along with the original smooth SnO2:F thin film. By readily modulating the surface morphology of ZnO-SnO2:F nanocomposite thin films with the initial ZnO NP surface coverage, the scattering efficiency of the incident light can remarkably be controlled over the 400-1100 nm solar spectrum wavelength range. High quality hazy ZnO-SnO2:F thin layers are therefore formed with an averaged haze factor ranging from 0.4 to 64.2% over the 400-1100 nm solar spectrum range while the sheet resistance is kept smaller than 15 Ω/sq for an average total optical transmittance close to 80%, substrate absorption and reflection included. Eventually, optical simulations using Fourier transform techniques are performed for computing the obtained haze factors and show good agreement with experimental data in the 400-1100 nm solar spectrum wavelength range. This opens up additional opportunities for further design optimization of nanoengineered transparent electrodes.
    Language English
    Publishing date 2014-08-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/am5034473
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Physical Origin of Negative Differential Resistance in V

    Das, Sujan Kumar / Nandi, Sanjoy Kumar / Marquez, Camilo Verbel / Rúa, Armando / Uenuma, Mutsunori / Puyoo, Etienne / Nath, Shimul Kanti / Albertini, David / Baboux, Nicolas / Lu, Teng / Liu, Yun / Haeger, Tobias / Heiderhoff, Ralf / Riedl, Thomas / Ratcliff, Thomas / Elliman, Robert Glen

    Advanced materials (Deerfield Beach, Fla.)

    2022  Volume 35, Issue 8, Page(s) e2208477

    Abstract: Oxides that exhibit an insulator-metal transition can be used to fabricate energy-efficient relaxation oscillators for use in hardware-based neural networks but there are very few oxides with transition temperatures above room temperature. Here the ... ...

    Abstract Oxides that exhibit an insulator-metal transition can be used to fabricate energy-efficient relaxation oscillators for use in hardware-based neural networks but there are very few oxides with transition temperatures above room temperature. Here the structural, electrical, and thermal properties of V
    Language English
    Publishing date 2022-12-30
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202208477
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Order via subito

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  5. Article: High Performance ZnO-SnO2:F Nanocomposite Transparent Electrodes for Energy Applications

    Giusti, Gaël / Bellet Daniel / Consonni Vincent / Puyoo Etienne

    ACS Applied Materials & Interfaces. 2014 Aug. 27, v. 6, no. 16

    2014  

    Abstract: Enhancing the propagation length of light without sacrificing the electro-optical properties of transparent electrodes is of particular interest to solar cells for reaching higher efficiency. This can typically be achieved by nanostructured electrodes ... ...

    Abstract Enhancing the propagation length of light without sacrificing the electro-optical properties of transparent electrodes is of particular interest to solar cells for reaching higher efficiency. This can typically be achieved by nanostructured electrodes but all too often at the expense of complexity and cost-effectiveness. In this work, we demonstrate the simple and low-cost fabrication of a new type of ZnO-SnO₂:F nanocomposite thin film by combining spin-coated ZnO nanoparticles on glass with fluorine-doped SnO₂ thin films deposited by atmospheric spray pyrolysis. The resulting nanocomposites exhibit a dual surface morphology featuring rough ZnO-SnO₂:F nanostructures along with the original smooth SnO₂:F thin film. By readily modulating the surface morphology of ZnO-SnO₂:F nanocomposite thin films with the initial ZnO NP surface coverage, the scattering efficiency of the incident light can remarkably be controlled over the 400–1100 nm solar spectrum wavelength range. High quality hazy ZnO-SnO₂:F thin layers are therefore formed with an averaged haze factor ranging from 0.4 to 64.2% over the 400–1100 nm solar spectrum range while the sheet resistance is kept smaller than 15 Ω/sq for an average total optical transmittance close to 80%, substrate absorption and reflection included. Eventually, optical simulations using Fourier transform techniques are performed for computing the obtained haze factors and show good agreement with experimental data in the 400–1100 nm solar spectrum wavelength range. This opens up additional opportunities for further design optimization of nanoengineered transparent electrodes.
    Keywords absorption ; cost effectiveness ; electrodes ; energy ; glass ; nanocomposites ; nanoparticles ; photovoltaic cells ; pyrolysis ; tin dioxide ; transmittance ; wavelengths ; zinc oxide
    Language English
    Dates of publication 2014-0827
    Size p. 14096-14107.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021%2Fam5034473
    Database NAL-Catalogue (AGRICOLA)

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    Kategorien

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  6. Article ; Online: Thermal exchange radius measurement: application to nanowire thermal imaging.

    Puyoo, Etienne / Grauby, Stéphane / Rampnoux, Jean-Michel / Rouvière, Emmanuelle / Dilhaire, Stefan

    The Review of scientific instruments

    2010  Volume 81, Issue 7, Page(s) 73701

    Abstract: In scanning thermal microscopy (SThM) techniques, the thermal exchange radius between tip and sample is a crucial parameter. Indeed, it limits the lateral spatial resolution but, in addition, an accurate value of this parameter is necessary for a precise ...

    Abstract In scanning thermal microscopy (SThM) techniques, the thermal exchange radius between tip and sample is a crucial parameter. Indeed, it limits the lateral spatial resolution but, in addition, an accurate value of this parameter is necessary for a precise identification of thermal properties. But until now, the thermal exchange radius is usually estimated but not measured. This paper presents an experimental procedure, based on the 3omega-SThM method, to measure its value. We apply this procedure to evaluate the thermal exchange radius of two commercial probes: the well-known Wollaston one and a new probe constituted of a palladium film on a SiO(2) substrate. Finally, presenting silicon nanowire images, we clearly demonstrate that this new probe can reach a spatial resolution better than 100 nm whereas the Wollaston probe hardly reaches a submicronic spatial resolution.
    Language English
    Publishing date 2010-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.3455214
    Database MEDical Literature Analysis and Retrieval System OnLINE

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