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Dilute nanocomposites for capacitive energy storage: progress, challenges and prospects.
Chem Sci
December 2024
Department of Materials Science and Engineering, The Pennsylvania State University, University Park PA 16802 USA
Electrostatic capacitors (ECs) are critical components in advanced electronics and electric power systems due to their rapid charge-discharge rate and high power density. While polymers are ideal for ECs due to their high voltage tolerance and mechanical flexibility, their low dielectric constants () and limited energy density remain significant limitations. Traditional polymer nanocomposites, which incorporate high- ceramic fillers, have shown promise in enhancing dielectric properties but often at the cost of electric breakdown strength and scalability.
View Article and Find Full Text PDFExperimental-Modeling Framework for Identifying Defects Responsible for Reliability Issues in 2D FETs.
ACS Appl Mater Interfaces
November 2024
KU Leuven, Celestijnenlaan 200D, Heverlee 3001, Belgium.
In this work, a self-consistent method is used to identify and describe defects plaguing 300 mm integrated 2D field-effect transistors. This method requires measurements of the transfer characteristic hysteresis combined with physics-based modeling of charge carrier capture and emission processes using technology computer aided design (TCAD) tools. The interconnection of experiments and simulations allows one to thoroughly characterize charge trapping/detrapping by/from defects, depending on their energy position.
View Article and Find Full Text PDFBreaking the size limitation of nonadiabatic molecular dynamics in condensed matter systems with local descriptor machine learning.
Proc Natl Acad Sci U S A
September 2024
Department of Chemistry, University of Southern California, Los Angeles, CA 90089.
Nonadiabatic molecular dynamics (NA-MD) is a powerful tool to model far-from-equilibrium processes, such as photochemical reactions and charge transport. NA-MD application to condensed phase has drawn tremendous attention recently for development of next-generation energy and optoelectronic materials. Studies of condensed matter allow one to employ efficient computational tools, such as density functional theory (DFT) and classical path approximation (CPA).
View Article and Find Full Text PDFEnhanced Positive Charge Performance in Triboelectric Series: Molecular Engineering of Conjugated Mesoporous Fibers for Machine Learning-Based Wearable Sensors.
Small
August 2024
Department of Polymer Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea.
With the increasing focus on triboelectric-based sensors, research on synthesizing dielectric layers from specific substances is gradually emerging. Despite numerous negatively-charged triboelectric materials, there is a scarcity of synthesizable positively-charged materials, creating a research gap. This study demonstrates the molecular design of a conjugated, mesoporous, self-assembled sheet via bottom-up synthesis.
View Article and Find Full Text PDFHarnessing Persistent Photocurrent in a 2D Semiconductor-Polymer Hybrid Structure: Electron Trapping and Fermi Level Modulation for Optoelectronic Memory.
Nano Lett
August 2024
Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea.
Recently, 2D semiconductor-based optoelectronic memory has been explored to overcome the limitations of conventional von Neumann architectures by integrating optical sensing and data storage into one device. Persistent photocurrent (PPC), essential for optoelectronic memory, originates from charge carrier trapping according to the Shockley-Read-Hall (SRH) model in 2D semiconductors. The quasi-Fermi level position influences the activation of charge-trapping sites.
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