Article
Materials Science, Multidisciplinary
Chandreswar Mahata, Muhammad Ismail, Dae Hwan Kim, Sungjun Kim
Summary: The reliable resistive switching performance of nanocrystalline-HfO2 in amorphous-HfOx has been demonstrated in the TaN/nc-HfO2/ITO memristor structure. The presence of nc-HfO2 and non-stoichiometric HfOx in the switching layer was confirmed using TEM and XPS. The narrowing of conductive filaments in an atomic scale under the influence of nc-HfO2 allows for the control of quantized conductance. Different current compliance and RESET stop voltages were found to enhance the resistive switching performances with multilevel resistance states behavior.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
C. -J. Liu, H. -Y. Lo, A. -Y. Hou, J. -Y. Chen, C. -H. Wang, C. -W. Huang, W. -W. Wu
Summary: One-dimensional metal oxide nanostructured materials have attracted attention for their properties and functionalities. This study investigated the resistive switching mechanism in a single Ta2O5 nanotube, revealing its dynamic behavior in memristive devices. The relationship between crystallinity and electrical properties was also explored.
MATERIALS TODAY NANO
(2022)
Article
Chemistry, Multidisciplinary
Chunyu Du, Zhiyang Qu, Yanyun Ren, Yongbiao Zhai, Jiangming Chen, Lili Gao, Ye Zhou, Su-Ting Han
Summary: By utilizing a silver imidazole complex as the switching medium, limiting the migration range of silver ions, and reducing spatial and temporal variations, the RRAM exhibits enhanced performance with low operation voltage, making it suitable for building logic gates. The self-reduction and grain boundary confinement effect of switching materials may pave the way for large-scale circuit development in non-volatile computing and machine learning.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Sergei Koveshnikov, Oleg Kononenko, Oleg Soltanovich, Olesya Kapitanova, Maxim Knyazev, Vladimir Volkov, Eugene Yakimov
Summary: Graphene oxide, among various graphene derivatives, is the most studied material due to its reliable and repeatable resistive switching properties. Researchers have identified three operative mechanisms responsible for this resistive switching, including metallic-like filamentary conduction, contact resistance modification, and oxidation/reduction in the bulk of graphene oxide.
Article
Multidisciplinary Sciences
Nikolay Frick, Mahshid Hosseini, Damien Guilbaud, Ming Gao, Thomas H. LaBean
Summary: This research analyzed the resistive switches of individual Ag2S nanowires and developed a model to reproduce experimental observations. The model considered the percolation of conductive filaments and the stochastic fluctuations of resistivity, successfully reproducing key features of resistive switching. Additionally, the model proposed a non-core shell structure of the Ag2S nanowires.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Harshit Sharma, Nitish Saini, Ajeet Kumar, Ritu Srivastava
Summary: This study proposes a solution-processed ternary metal chalcogenide AgBiS2 quantum dots as a functional layer in a memristive device, exhibiting electroforming-free resistive switching with low power consumption. The working mechanism involves the migration of electrochemically active Ag metal ions and sulfur vacancies to form a conductive filament. Multiple quantum conductance levels are achieved by controlling the compliance current during the set process, making this device suitable for ultra-high density multi-level memory applications with low power consumption.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Physics, Applied
Oleg G. Kharlanov, Boris S. Shvetsov, Vladimir V. Rylkov, Anton A. Minnekhanov
Summary: This study experimentally demonstrates enhanced conductive filament stability in memristors with copper filaments under applied voltage. A simplified theoretical model is presented to describe the effect of a quantum current through a filament on its shape. The quantum pressure competes with surface tension and significantly affects the evolution of the filament profile at voltages around 1V, providing extra stability for quantized conductance filaments at lower voltages.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Shenghua Cheng, Xiaohu Wang, Hao Zhang, Yongbo Liu, Tingying Shen, Xinyi Li, Bin Gao, He Qian
Summary: Multi-level cell storage technology based on resistive random access memory (RRAM) with multi-level state characteristics is an attractive approach for achieving low-cost ultra-high-density nonvolatile memory. Despite the extensive research on multi-level state characteristics of RRAM, a unified model that explains the existence of intermediate resistance state (IRS) and the switching mechanism between different resistance states is still lacking. This study proposes a trap-assisted tunneling model that is consistent with the measured results and can reproduce the multi-level state characteristics by considering the interaction between defects and oxygen vacancies at the interface of HfOx and TiN electrode. The model also explains the wide spread of high resistance state (HRS) and the switching between HRS and IRS based on the distance of tunneling gap.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Motoki Ohi, Fumiya Fukunaga, Hayate Murakami, Hiroyuki Kageshima, Yasuhide Ohno, Masao Nagase
Summary: In this study, stacked graphene diodes were fabricated via direct bonding using single-crystal graphene on a SiC substrate. Switching and S-shaped negative resistance were observed in the electrical properties of the junction. The high-resistance state switched to the low-resistance state after applying a maximum junction voltage of around 10 V.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Essraa A. Hussein, Ryan J. White
Summary: Resistive pulse sensing using ion channel proteins has evolved as a single-molecule approach with high molecular selectivity, but requires a stable lipid membrane. The newly developed gold electrode-supported bilayer technology offers high spatial resolution but suffers from channel current decay. Introducing a silver nanoneedle to support lipid bilayer formation and ion channel measurements can mitigate current decay and produce stable DC channel currents.
ANALYTICAL CHEMISTRY
(2021)
Article
Computer Science, Information Systems
Rocio Romero-Zaliz, Eduardo Perez, Francisco Jimenez-Molinos, Christian Wenger, Juan B. Roldan
Summary: A comprehensive analysis was conducted on two types of artificial neural networks, revealing that convolutional neural networks (CNN) outperform multilayer perceptrons (MLP) in image recognition processes due to the ability of convolutional layers to extract image features and reduce data complexity.
Article
Chemistry, Physical
Ji-Hyun Cha, Jong Yun Kim, Young-Jun Yu, Duk-Young Jung
Summary: In this study, a Cu-substituted beta-Ag0.7Cu0.3I solid electrolyte was successfully prepared by sequential deposition of a Cu metal layer onto an AgI thin film. This Cu substitution improved the resistive switching properties of intrinsic polycrystalline AgI thin films and resulted in enhanced performance of ReRAM thin film devices based on beta'-Ag0.7Cu0.3I, with high ON/OFF ratio and low working voltage. These findings suggest that binary metal halide materials can be used for efficient formation of metal filaments and have potential applications in low-cost, low-power memory.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Chandreswar Mahata, Sungjun Kim
Summary: By controlling the Al ratio during atomic layer deposition, significant improvement in resistive switching behavior of Al-doped HfAlO-based RRAM devices was achieved, leading to enhanced on/off ratio and retention properties. Multilevel conductance modulation and synaptic properties of potentiation/depression were successfully demonstrated.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Juan Ignacio Diaz Schneider, Paula Cecilia Angelome, Leticia Paula Granja, Cynthia Paula Quinteros, Pablo Eduardo Levy, Eduardo David Martinez
Summary: This paper investigates the resistive switching phenomena in percolative networks of silver nanowires coated with a thin layer of polyvinylpyrrolidone. The system exhibits different conductance levels and resistance state transitions under different environmental conditions, which is significant for the development of AgNWs-based electronics and in-hardware neuromorphic computing.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Minsu Park, Jongmin Park, Sungjun Kim
Summary: In this work, the switching mechanisms of Ni/SiOx/ITO devices before and after reversible switching were studied, and their application in neuromorphic computing systems was investigated. Different electrical measurements and behaviors were observed in the RRAM devices, which were attributed to a change in the switching mechanisms induced by reversible switching in negative polarity. The identified electrical features were further used to implement neural networks.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Cavit Eyovge, Cristian S. Deenen, Francisco Ruiz-Zepeda, Stephan Bartling, Yury Smirnov, Monica Morales-Masis, Arturo Susarrey-Arce, Han Gardeniers
Summary: Co-axial electrospinning was used to structure non-woven webs of TiO2 nanofibers loaded with Ag, Au, and CuO nanoparticles. Different nanoparticle compositions in the TiO2 composite layers showed distinct colors in electrochromic applications. Among them, the Au/TiO2 layer exhibited the most promising performance with favorable characteristics for electrochromic applications.
ACS APPLIED NANO MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Ferdinand Evers, Amnon Aharony, Nir Bar-Gill, Ora Entin-Wohlman, Per Hedegard, Oded Hod, Pavel Jelinek, Grzegorz Kamieniarz, Mikhail Lemeshko, Karen Michaeli, Vladimiro Mujica, Ron Naaman, Yossi Paltiel, Sivan Refaely-Abramson, Oren Tal, Jos Thijssen, Michael Thoss, Jan M. van Ruitenbeek, Latha Venkataraman, David H. Waldeck, Binghai Yan, Leeor Kronik
Summary: This article provides a critical overview of the theory of the chirality-induced spin selectivity (CISS) effect and reviews its applications in electron processes. It discusses the latest developments in the understanding of the CISS effects in electron transmission, electron transport, and chemical reactions, and identifies the remaining challenges and research opportunities.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hosein Ghobadi, Yury Smirnov, Herman L. Offerhaus, Jose A. Alvarez-Chavez, Monica Morales-Masis, Israel De Leon
Summary: Transparent conducting oxides (TCOs) have attracted much attention in optics and photonics due to their excellent linear and nonlinear optical response in the near-zero permittivity spectral region. In this study, epitaxial, highly-textured, and polycrystalline tin-doped indium oxide (ITO) films were fabricated to investigate the effect of crystal quality on optical mobility, effective electron mass, and optical properties in the near-zero permittivity spectral region.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Kassio P. S. Zanoni, Abhyuday Paliwal, M. Angeles Hernandez-Fenollosa, Pierre-Alexis Repecaud, Monica Morales-Masis, Henk J. Bolink
Summary: This study demonstrates the successful direct deposition of indium tin oxide (ITO) films on semitransparent perovskite solar cells using an industrial pulsed laser deposition (PLD) tool, without causing damage to the device stack. By optimizing the morphological, electronic, and optical properties of the PLD deposited ITO films, efficient solar cell performance was achieved.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Hosein Ghobadi, Yury Smirnov, Jeroen P. Korterik, Jose A. Alvarez-Chavez, Herman L. Offerhaus, Monica Morales-Masis, Israel De Leon
Summary: Investigation of polycrystalline indium-zirconium oxide (IZrO) as a potential new TCO material with high optical mobility and broadband nonlinear response in the epsilon-near-zero (ENZ) region.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Phu Tran Phong Le, Shu Ni, Pierre-Alexis Repecaud, Emma van der Minne, Karin J. H. Van den Nieuwenhuijzen, Minh Duc Nguyen, Johan E. ten Elshof, Monica Morales-Masis, Gertjan Koster
Summary: Correlated metals with high carrier density and strongly correlated electron effects provide an alternative route to achieve transparent conducting materials. This study demonstrates that Ca2Nb3O10 nanosheets with different buffer layers promote the growth of high-quality 4d(2) SrMoO3 films on fused silica substrates, overcoming the use of expensive and size-limited single-crystal substrates.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Optics
Hosein Ghobadi, Herman L. Offerhaus, Jose A. Alvarez-Chavez, Monica Morales-Masis, Israel De Leon
Summary: Transparent Conducting Oxides (TCOs) in the Epsilon-Near-Zero (ENZ) spectral region exhibit a large and ultrafast intensity-dependent refractive index, which is highly dependent on material properties and measurement conditions. This study demonstrates that extensive nonlinear optical measurements can be avoided by analyzing the material's linear optical response. By considering thickness-dependent material parameters, the impact on absorption and field intensity enhancement under different measurement conditions can be determined, allowing for optimization of the nonlinear response. Experimental measurements of Indium-Zirconium Oxide (IZrO) thin films with varying thicknesses confirm the agreement between experiment and theory, and show that film thickness and excitation angle can be adjusted simultaneously for optimizing the nonlinear optical response, enabling flexible design of highly nonlinear TCO-based optical devices.
Article
Chemistry, Multidisciplinary
Tatiana Soto-Montero, Suzana Kralj, Wiria Soltanpoor, Junia S. Solomon, Jennifer S. Gomez, Kassio P. S. Zanoni, Abhyuday Paliwal, Henk J. Bolink, Christoph Baeumer, Arno P. M. Kentgens, Monica Morales-Masis
Summary: Vapor deposition shows great potential for scalable and industrial processing of perovskite solar cells, offering advantages such as toxicity-free processing, thickness control, and uniform coating. However, the different volatilities of the organic and inorganic components of perovskites currently require multiple thermal sources or two-step deposition. In this study, single-source, single-step pulsed laser deposition is demonstrated for the deposition of tunable MA(1-x)FA(x)PbI(3) thin films. The room temperature formation of cubic alpha-phase MA(1-x)FA(x)PbI(3) films is achieved by controlling laser ablation of a solid target with adjustable ratios of MAI:FAI:PbI2. The target-to-film transfer of the ablated species is confirmed, and proof-of-concept solar cells with 14% efficiency are demonstrated. This research paves the way for future developments in industry-compatible vapor deposition methods for perovskite solar cells.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Kassio P. S. Zanoni, Daniel Perez-del-Rey, Chris Dreessen, Nathan Rodkey, Michele Sessolo, Wiria Soltanpoor, Monica Morales-Masis, Henk J. Bolink
Summary: This study investigates the application of SnO2-based electron transport layers (ETL) in perovskite solar cells (PSCs). It is found that by controlling the deposition parameters of pulsed laser deposition (PLD) technique, SnO2 films with low roughness can be obtained. The concentration of oxygen in the background gas is also shown to affect the number of oxygen vacancies in the film. Solar cells with methyl-ammonium lead iodide perovskite absorber layer and SnO2 ETL deposited by PLD under optimized conditions achieve power conversion efficiencies exceeding 18%, comparable to those with atomic layer deposited SnO2 ETL.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Jan M. M. van Ruitenbeek, Richard Korytar, Ferdinand Evers
Summary: By introducing a simple model system, we have found that chirality-induced spin selectivity can be understood as the result of constructive interference of partial waves scattered by the spin-orbit terms. Forward scattering rates are found to be independent of spin, while back scattering is spin dependent over wide energy windows.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Energy & Fuels
Wiria Soltanpoor, Andrea E. A. Bracesco, Nathan Rodkey, Mariadriana Creatore, Monica Morales-Masis
Summary: This study demonstrates the deposition of SnO2 buffer layer using pulsed laser deposition (PLD) for p-i-n perovskite solar cells (PSCs) at room temperature. The PLD SnO2-based solar cells show comparable efficiencies to those fabricated using atomic layer deposition (ALD), but with the advantages of solvent-free room temperature processing and wafer-scale production.
Article
Nanoscience & Nanotechnology
Julian Skolaut, Jedrzej Tepper, Federica Galli, Wulf Wulfhekel, Jan M. van Ruitenbeek
Summary: Determining the conductivity of molecular layers is crucial in molecular electronics. We utilized conductive atomic force microscopy to investigate the influence of gold substrate roughness on conductivity variation, finding that substrate roughness plays a crucial role.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
W. Dednam, S. Tewari, E. B. Lombardi, J. J. Palacios, J. M. van Ruitenbeek, C. Sabater
Summary: This article studies the dynamic bonding of gold atoms on surfaces under low coordination conditions using low-temperature scanning tunneling microscopy. By conducting experiments with an atomically sharp gold tip and utilizing classical molecular dynamics simulations and density-functional theory calculations, the differences in bonding behavior between different positions are elucidated, as well as providing information on the crystalline classification of the STM tips based on their performance.
Article
Materials Science, Multidisciplinary
Dmitry Dzhigaev, Yury Smirnov, Pierre-Alexis Repecaud, Lucas Atila Bernardes Marcal, Giovanni Fevola, Dina Sheyfer, Quentin Jeangros, Wonsuk Cha, Ross Harder, Anders Mikkelsen, Jesper Wallentin, Monica Morales-Masis, Michael Elias Stuckelberger
Summary: Understanding the grain morphology and kinetics of solid-phase crystallization is crucial for controlling the functional properties of polycrystalline materials. In this study, in situ coherent X-ray diffraction imaging and transmission electron microscopy were used to quantitatively elucidate the kinetics of single-grain growth in Zr-doped In2O3 films. The results show that the Johnson-Mehl-Avrami-Kolmogorov theory, which describes the average kinetics of polycrystalline films growth, can also be applied to single grains. This research provides important insights into the understanding and control of the crystallization processes of transparent conductive oxides and other polycrystalline materials at the nanoscale.
COMMUNICATIONS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yury Smirnov, Pierre-Alexis Repecaud, Leonard Tutsch, Ileana Florea, Kassio P. S. Zanoni, Abhyuday Paliwal, Henk J. Bolink, Pere Roca Cabarrocas, Martin Bivour, Monica Morales-Masis
Summary: The use of pulsed laser deposition (PLD) for tin-doped indium oxide (ITO) fabrication at different pressures showed improved performance in perovskite cells but potential increase in series resistance in silicon heterojunction (SHJ) cells. The optimized ITO films with high carrier density achieved over 21% SHJ efficiency, while reducing ITO thickness and using TiOx for optical compensation led to SHJ devices with reduced indium consumption and efficiencies of over 22%.
MATERIALS ADVANCES
(2022)
