Meysam Heydari GharahcheshmehSan Diego State University | SDSU
Meysam Heydari Gharahcheshmeh
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35
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Publications (35)
Conducting polymers have attracted significant interest due to their unique properties, including metal-like conductivity, ionic conductivity, optical transparency, and mechanical flexibility. Poly(3,4-ethylene-dioxythiophene):poly(styrene sulfone) (PEDOT:PSS) is commonly utilized as the hole transport layer (HTL) in optoelectronic devices. However...
In advanced manufacturing, optimizing mixed-model synchronous assembly lines (MMALs) is crucial for enhancing productivity and adhering to sustainability principles, particularly in terms of energy consumption and energy-efficient sequencing. This paper introduces a novel approach by categorizing sequence-dependent setup times into bipartite catego...
Carbon cloth shows potential for flexible energy storage electrodes but encounters challenges such as low specific capacitance and limited wettability. This study addresses these limitations by fabricating a highly conformal coating of poly(3,4‐ethylenedioxythiophene) (PEDOT) around 3D carbon fibers via the oxidative chemical vapor deposition (oCVD...
Perovskite solar cells (PSCs) exhibit remarkable power conversion efficiency (PCE) but face limitations due to poor stability, restricting their practical applications. The commonly used hole transport layer, poly(3,4-ethylene dioxythiophene):polystyrenesulfonate (PEDOT:PSS), suffers from inherent acidity that compromises PSCs device stability thro...
Among the diverse range of modern renewable energy storage technologies, electrochemical energy storage devices have been rapidly adopted across various applications owing to their superior characteristics, including high coulombic efficiency, elevated energy and power densities, scalability, modularity, and rapid response capabilities. Conjugated...
Advanced conductors (such as conducting and semiconducting polymers) are vital building blocks for modern technologies and biocompatible devices as faster computing and smaller device sizes are demanded. Conjugated conducting and semiconducting polymers (including poly(3,4-ethylenedioxythiophene) (PEDOT), polyaniline (PANI), polythiophene (PTh), an...
There is an increasing demand for flexible, lightweight, mobile devices such as roll-up displays, electronic papers, wearable sensors, and soft robots. Flexible devices can also be readily formed into shapes that are easily integrated into large-scale applications, including vehicles, signage, and architectural lighting. Powering these flexible dev...
In article number 2008712, Meysam Heydari Gharahcheshmeh, Karen K. Gleason, and co‐workers present remarkable texture and nanostructural engineering of poly(3,4‐ethylenedioxythiophene) (PEDOT) thin films grown by water‐assisted oxidative chemical vapor deposition, which yields a record high electrical conductivity of 7520 S/cm. In PEDOT thin films...
A new volatile organic compounds (VOCs) sensing concept called humidity‐initiated gas (HIG) sensors is described and demonstrated. HIG sensors employ the impedance of water assembled at sensor interfaces when exposed to humidity to sense VOCs at low concentrations. Here, two HIG sensor variants are studied—Type I and Type II. Type I sensors benefit...
Chemical vapour deposition (CVD) is a powerful technology for producing high-quality solid thin films and coatings. Although widely used in modern industries, it is continuously being developed as it is adapted to new materials. Today, CVD synthesis is being pushed to new heights with the precise manufacturing of both inorganic thin films of 2D mat...
Engineering the texture and nanostructure to improve the electrical conductivity of semicrystalline conjugated polymers must address the rate‐limiting step for charge carrier transport. In highly face‐on orientation, the charge transport between chains within a crystallite becomes rate‐limiting, which is highly sensitive to the π–π stacking distanc...
Conducting polymers have attracted tremendous attention because of their unique characteristics, such as metal-like conductivity, ionic conductivity, optical transparency, and mechanical flexibility. Texture and nanostructural engineering of conjugated conducting polymers provide an outstanding pathway to facilitate their adoption in a variety of t...
Surface engineering of porous carbon electrodes is an effective strategy to enhance the power output of redox flow batteries (RFBs) and may enable new cost reduction pathways for energy storage. Here, a surface modification strategy that enhances the electrochemical performance of RFBs in iron‐based electrolytes is demonstrated. Nanometric films of...
Ultra‐lightweight and flexible solar cells are desired for many potential applications, such as self‐powered aviation, wearable electronics, and the Internet of things. PbS quantum dots (QDs) are good candidates for this purpose due to their low‐cost and low‐temperature processing. In this work, a thin layer of parylene (1 µm) is deposited on a pol...
For semicrystalline poly(3,4-ethylene dioxythiophene) (PEDOT), oxidative chemical vapor deposition (oCVD) enables systematic control over the b -axis lattice parameter (π-π stacking distance). Decreasing the b -axis lattice parameter increases the charge transfer integral, thus enhancing intracrystallite mobility. To reduce the barrier to intercrys...
In this work,
$REBa_{2}Cu_{3}O_{7-\delta}$
(RE = rare earth elements, REBCO) coated conductors with different content of self-assembled BaZrO3 (BZO) nanorods were grown by Metal Organic Chemical Vapor Deposition (MOCVD) using a roll-to-roll process. Small changes in chemical composition affecting Ba to Cu stoichiometry and induce variation in REB...
Uniform, ultra‐thin, and conformal films of conducting polymers can be readily fabricated directly onto large‐area substrates by oxidative chemical vapor deposition (oCVD). Since oCVD avoids high substrate temperatures and the use of solvents, no transfer step is required for integrating oCVD films into devices, even when employing paper and textil...
Conducting polymers (CPs) combine electronic conductivity, optical transparency, and mechanical flexibility compatible with lightweight substrates. Due to these features CPs exhibit promising performance for a wide range of applications including electronic, optoelectronic, electrochemical, optochemical, and energy storage and harvesting devices. F...
The relation between the c-axis lattice parameter of REBa2Cu3O7−δ (REBCO and RE = Gd, Y) superconductors with 25 mol.% Zr addition and the critical current density (Jc) was determined at (77 K, 0 T), (30 K, 3 T (B||c)), and (30 K, 9 T (B||c)). In this work, heavily doped Zr-added REBCO films with the thickness of 0.9 µm were fabricated by metal org...
A main challenge that significantly impedes REBa2Cu3Ox (RE = rare earth) coated conductor applications is the low engineering critical current density Je because of the low superconductor fill factor in a complicated layered structure that is crucial for REBa2Cu3Ox to carry supercurrent. Recently, we have successfully achieved engineering critical...
The requirements for achieving critical current densities above 3.5 MA cm
<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup>
at 77 K, 0 T in heavily-doped Zr-added REBa2Cu3O7-δ (REBCO and RE = Gd, Y) coated conductors were previously determined. In this work, the effects of deposition temperature...
For REBa
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>
Cu
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>
O
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub>
(REBCO, where RE = rare ear...
The superconducting transition width (ΔTc) characteristics of REBa2Cu3O7-δ (REBCO and RE = Gd, Y) superconductor tapes with Zr content of 25 mol% with high lift factor (ratio of critical current density (Jc) at 30 K, 3 T (B||c) to the Jc at 77 K, 0 T) has been determined. In this work, heavily doped (Gd, Y)Ba2Cu3O7-δ superconductor tapes with 25 mo...
We have developed processes to fabricate SnO 2 nanowires on single crystalline-like buffer surfaces on flexible metal substrates with controlled alignment and density while eliminating undesired in-plane nanostructures that can be deleterious to subsequent epitaxial growth of superconductor film. The in-plane nanostructures formed due to the mobili...
We have developed processes to fabricate SnO2 nanowires on single crystalline-like buffer surfaces on flexible metal substrates with controlled alignment and density while eliminating undesired in-plane nanostructures that can be deleterious to subsequent epitaxial growth of the superconductor film. The in-plane nanostructures formed due to the mob...
Critical current densities (J
c) above 15 MA cm−2 have been achieved at 30 K, 2.5 T (B||c) in (Gd,Y)–Ba–Cu–O tapes with 20–25 mol.% Zr addition. The optimal compositions of Gd + Y, Ba + Zr and Cu to achieve lift factor in critical current above 6 at 30 K, 2.5 T (B||c) have been determined by development of a composition map of the performance of he...
We have conducted a critical current density J c(T, H) study over a wide temperature T from 77 down to 20 K and a magnetic field H up to 9 T on more than 50 ∼ 0.9 μm-thick REBa2Cu3O7−δ (RE = rare earth) thin films containing different concentrations of BaZrO3 (BZO). We found that, independent of the composition, there is a linear correlation betwee...
A critical current (I c) value of 3963 A/12 mm, corresponding to a critical current density (J c) of 15 MA cm−2 has been achieved at 30 K, 3 T in the orientation of field parallel to the c-axis (B||c) in 2.2 μm thick film (Gd,Y)BaCuO tapes with 20 mol% Zr addition made by metal organic chemical vapor deposition. This J c level is more than a factor...
REBa2
Cu
3Ox ((REBCO), RE = rare earth) superconductor tapes with moderate levels of dopants have been optimized for high critical current density in low magnetic fields at 77 K, but they do not exhibit exemplary performance in conditions of interest for practical applications, i.e., temperatures less than 50 K and fields of 2–30 T. Heavy doping of...
We report the microstructural characteristics of high levels of Zr-added REBa2Cu3O7-x (RE = Gd, Y rare earth) coated conductors fabricated by Metal Organic Chemical Vapor Deposition (MOCVD). The enhancements of the lift factor defined as a ratio of the in-field (3 T, B ∥ c-axis) critical current density (Jc) at 30 K and self-field Jc at 77 K have b...
Zn–Co alloy coatings were electrodeposited on steel substrate using a cyanide-free alkaline bath containing glycine as a complexing agent. The effect of pulse current parameters, such as current-on time (Ton), current-off time (Toff) and peak current density (Ip) on the surface morphology, chemical composition and phase distribution of coatings wer...
Zn-Co alloy electrodeposits were obtained from weakly alkaline glycine
solutions by using direct current. The influence of current density,
electrolyte temperature, electrolyte's Co^2+ concentration on the
surface morphology and chemical composition were investigated by using
scanning electron microscope (SEM) and energy dispersive spectroscopy
(ED...
Co-deposition of Zn–Co alloy coatings that were electrodeposited from weakly alkaline glycine solutions has been studied by
cyclic voltammetry. Scanning electron microscopy (SEM), energy depressive spectroscopy (EDS), and X-ray diffraction (XRD)
analyses were used to study surface morphology, chemical composition, and phase structure of the coating...
The corrosion behavior of Zn and Zn–Co alloy electrodeposits that were obtained from weakly alkaline glycine solutions has been studied. SEM, EDS and XRD were used to study surface morphology, chemical composition and phase structure of the coatings. Corrosion behavior of Zn and Zn–Co alloy coatings was studied by using potentiodynamic polarization...