1. Nov 2022 Journal Article Biomedical Optics Express

    Silicon-photonics focused ultrasound detector for minimally invasive optoacoustic imaging

    Abstract

    One of the main challenges in miniaturizing optoacoustic technology is the low sensitivity of sub-millimeter piezoelectric ultrasound transducers, which is often insufficient for detecting weak optoacoustic signals. Optical detectors of ultrasound can achieve significantly higher sensitivities than their piezoelectric counterparts for a given sensing area but generally

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  2. 6 Oct 2022 Journal Article Nature Communications

    Mode coupling bi-stability and spectral broadening in buckled carbon nanotube mechanical resonators

    Abstract

    Bi-stable mechanical resonators play a significant role in various applications, such as sensors, memory elements, quantum computing and mechanical parametric amplification. While carbon nanotube based resonators have been widely investigated as promising NEMS devices, a bi-stable carbon nanotube resonator has never been demonstrated. Here, we report a class of carbon

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  3. 3 Oct 2022 Conference Paper Organic, Hybrid, and Perovskite Photovoltaics XXIII

    The interplay between device’s and material’s properties in determining solar cells’ performance

    Abstract

    This contribution highlights the importance of device architecture design using a comprehensive semiconductor device model. In the context of organic PV, we show that the mobility balance is not an issue and that the only important guideline is to ensure that the lowest mobility is above 4x10-4 cm2 V-1 s-1 . With this out of the way, researchers could focus on more

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  4. 1 Oct 2022 Journal Article Ultramicroscopy

    Elastic and inelastic mean free paths for scattering of fast electrons in thin-film oxides

    Adham Basha, George Levi, Tamir Amrani, Yang Li, Guy Ankonina, Pini Shekhter, Lior Kornblum, Ilan Goldfarb, Amit Kohn
    Abstract

    Quantitative transmission electron microscopy (TEM) often requires accurate knowledge of sample thickness for determining defect density, structure factors, sample dimensions, electron beam and X-ray photons signal broadening. The most common thickness measurement is by Electron Energy Loss Spectroscopy which can be applied effectively to crystalline and amorphous

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  5. 28 Sep 2022 Journal Article Nano Letters

    DC Signature of Snap-through Bistability in Carbon Nanotube Mechanical Resonators

    Abstract

    Bistable arched beams exhibiting Euler-Bernoulli snap-through buckling are widely investigated as promising candidates for various potential applications, such as memory devices, energy harvesters, sensors, and actuators. Recently, we reported the realization of a buckled suspended carbon nanotube (CNT) based bistable resonator, which exhibits a unique three-dimensional

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  6. 20 Sep 2022 Journal Article Solid-State Electronics

    Wear-out and breakdown of Ta2O5/Nb:SrTiO3 stacks

    S Boyeras Baldomá, Sebastian M Pazos, Fernando L Aguirre, Guy Ankonina, Lior Kornblum, Eilam Yalon, Felix Palumbo
    Abstract

    Tantalum oxide (Ta2O5) is widely used in electronics, with important applications in backend capacitors and memristors. However, major technological challenges have to be faced and solved. Also, concerns related to the reliability of these new stacks have to be taken into consideration. We report the reliability of Ta2O5 films focusing on the dynamics of the charge

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  7. 20 Sep 2022 Journal Article Chemical Physics Reviews

    Charge dissociation in organic solar cells—from Onsager and Frenkel to modern models

    Abstract

    Organic-based solar cells have developed for the last three decades. Moving forward generally requires the assistance of useful models that are adapted to currently used materials and device architectures. The least understood part of the charge generation is the first step of the exciton dissociation, and new or refined models are being suggested. However, many of

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  8. 8 Sep 2022 Journal Article The Journal of Physical Chemistry Letters

    Vibrational Polaritons in Disordered Molecular Ensembles

    Abstract

    Disorder is an intrinsic attribute of any realistic molecular system. It is known to lead to localization, which hampers efficient transport. It was recently proposed that in molecular ensembles strongly coupled to photonic cavities, moderate disorder leads to delocalization and increases of the transport and chemical reaction rates. Vibrational polaritons involve

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  9. 7 Sep 2022 Journal Article ACS Energy Letters

    Persistent Ion Accumulation at Interfaces Improves the Performance of Perovskite Solar Cells

    Joshua A Kress, Claudio Quarti, Qingzhi An, Sapir Bitton, Nir Tessler, David Beljonne, Yana Vaynzof
    Abstract

    The mixed ionic–electronic nature of lead halide perovskites makes their performance in solar cells complex in nature. Ion migration is often associated with negative impacts─such as hysteresis or device degradation─leading to significant efforts to suppress ionic movement in perovskite solar cells. In this work, we demonstrate that ion trapping at the perovskite/electron

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  10. 6 Sep 2022 Journal Article Materials

    In Situ Nano-Indentation of a Gold Sub-Micrometric Particle Imaged by Multi-Wavelength Bragg Coherent X-ray Diffraction

    Florian Lauraux, Stephane Labat, Marie-Ingrid Richard, Steven J Leake, Tao Zhou, Oleg Kovalenko, Eugen Rabkin, Tobias U Schülli, Olivier Thomas, Thomas W Cornelius
    Abstract

    The microstructure of a sub-micrometric gold crystal during nanoindentation is visualized by in situ multi-wavelength Bragg coherent X-ray diffraction imaging. The gold crystal is indented using a custom-built atomic force microscope. A band of deformation attributed to a shear band oriented along the (221) lattice plane is nucleated at the lower left corner of the

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