Browsing Institute of Advanced Materials (INAM) by Keyword "electrical properties"
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A Frequency Domain Analysis of the Excitability and Bifurcations of the FitzHugh–Nagumo Neuron Model
American Chemical Society (2021-11-18)The dynamics of neurons consist of oscillating patterns of a membrane potential that underpin the operation of biological intelligence. The FitzHugh−Nagumo (FHN) model for neuron excitability generates rich dynamical ... -
Accelerating the Assessment of Hysteresis in Perovskite Solar Cells
American Chemical Society (2024)Halide perovskite materials have reached important milestones in the photovoltaic field, positioning them as realistic alternatives to conventional solar cells. However, unavoidable kinetic phenomena have represented a ... -
Capacitive and Inductive Characteristics of Volatile Perovskite Resistive Switching Devices with Analog Memory
American Chemical Society (2024-06-13)With the increasing demands and complexity of the neuromorphic computing schemes utilizing highly efficient analog resistive switching devices, understanding the apparent capacitive and inductive effects in device operation ... -
Chemical Inductor
American Chemical Society (2022-03-22)A multitude of chemical, biological, and material systems present an inductive behavior that is not electromagnetic in origin. Here, it is termed a chemical inductor. We show that the structure of the chemical inductor ... -
Coupling between Ion Drift and Kinetics of Electronic Current Transients in MAPbBr3 Single Crystals
American Chemical Society (2022-03-11)The optoelectronic properties of halide perovskite materials have fostered their utilization in many applications. Unravelling their working mechanisms remains challenging because of their mixed ionic–electronic conductive ... -
Dynamic Instability and Time Domain Response of a Model Halide Perovskite Memristor for Artificial Neurons
American Chemical Society (2022-04-22)Memristors are candidate devices for constructing artificial neurons, synapses, and computational networks for brainlike information processing and sensory-motor autonomous systems. However, the dynamics of natural neurons ... -
Electrical Charge Coupling Dominates the Hysteresis Effect of Halide Perovskite Devices
American Chemical Society (2023-01-24)Hysteresis effects in ionic-electronic devices are a valuable resource for the development of switching memory devices that can be used in information storage and brain-like computation. Halide perovskite devices show ... -
From Frequency Domain to Time Transient Methods for Halide Perovskite Solar Cells: The Connections of IMPS, IMVS, TPC, and TPV
American Chemical Society (2021-08-26)The correlation of different methods of measurement can become an important tool to identify the dominant physical elements that govern the electronic and ionic dynamics in perovskite solar cells. The diverse phenomena ... -
Hysteresis in Organic Electrochemical Transistors: Distinction of Capacitive and Inductive Effects
American Chemical Society (2023-12-14)Organic electrochemical transistors (OECTs) are effective devices for neuromorphic applications, bioelectronics, and sensors. Numerous reports in the literature show persistent dynamical hysteresis effects in the current–voltage ... -
Impedance Spectroscopy Dynamics of Biological Neural Elements: From Memristors to Neurons and Synapses
American Chemical Society (2021-09-09)Understanding the operation of neurons and synapses is essential to reproducing biological computation. Building artificial neuromorphic networks opens the door to a new generation of faster and low-energy-consuming ... -
Impedance Spectroscopy of Metal Halide Perovskite Solar Cells from the Perspective of Equivalent Circuits
American Chemical Society (2021-12-08)Impedance spectroscopy (IS) provides a detailed understanding of the dynamic phenomena underlying the operation of photovoltaic and optoelectronic devices. Here we provide a broad summary of the application of IS to metal ... -
Improved Stability of Inverted and Flexible Perovskite Solar Cells with Carbon Electrode
American Chemical Society (2020-06-02)We demonstrate highly efficient, stable, and flexible perovskite solar cells of large areas, utilizing a carbon back-contact electrode in a p–i–n cell configuration. We enabled good electronic contact at the interface with ... -
Interfacial Mechanism for Efficient Resistive Switching in Ruddlesden-Popper Perovskites for Non-volatile Memories
American Chemical Society (2020-01-16)Ion migration, one origin of current–voltage hysteresis, is the bane of halide perovskite optoelectronics. Herein, we leverage this unwelcome trait to unlock new opportunities for resistive switching using layered ... -
Interpretation of the Recombination Lifetime in Halide Perovskite Devices by Correlated Techniques
American Chemical Society (2022-08-03)The recombination lifetime is a central quantity of optoelectronic devices, as it controls properties such as the open-circuit voltage and light emission rates. Recently, the lifetime properties of halide perovskite devices ... -
Locating the Frequency of Turnover in Thin-Film Diffusion Impedance
American Chemical Society (2021-07-12)The impedance of diffusion is an important tool to investigate a wide variety of systems, including electrochemical devices such as Li-ion batteries, porous electrodes, and solar cells. The classical impedance model ... -
Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells
American Chemical Society (2020-10-01)Negative capacitance in the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, which origin is still under discussion. Here we use impedance spectroscopy to analyze these responses ... -
Negative Transient Spikes in Halide Perovskites
American Chemical Society (2022-07-18)The internal crossfire of ionic and electronic effects in perovskite devices forms a complex analysis problem that has not been fully solved yet. Specifically, halide photovoltaic perovskites show a photoinduced ionic ... -
Physical Model for the Current–Voltage Hysteresis and Impedance of Halide Perovskite Memristors
American Chemical Society (2022-03-01)An investigation of the kinetic behavior of MAPbI3 memristors shows that the onset voltage to a high conducting state depends strongly on the voltage sweep rate, and the impedance spectra generate complex capacitive and ... -
Removing Instability-Caused Low-Frequency Features in Small Perturbation Spectra of Perovskite Solar Cells
American Chemical Society (2020-06-29)Small-perturbation frequency-domain techniques such as impedance spectroscopy and intensity-modulated photocurrent spectroscopy (IMPS) have become important methods for the investigation of the physical working mechanisms ... -
Spectroelectrochemical Analysis of the Water Oxidation Mechanism on Doped Nickel Oxides
American Chemical Society (2022-04-20)Metal oxides and oxyhydroxides exhibit state-of-the-art activity for the oxygen evolution reaction (OER); however, their reaction mechanism, particularly the relationship between charging of the oxide and OER kinetics, ...