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High Gain, Low Voltage Solar-Blind Deep UV Photodetector Based on GaO/(AlGa)O/GaN nBp Heterojunction.
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January 2025
Key Laboratory of UV Light Emitting Materials and Technology, Ministry of Education, Northeast Normal University, Changchun, 130024, China.
In this study an (AlGa)O barrier layer is inserted between β-GaO and GaN in a p-GaN/n-GaO diode photodetector, causing the dark current to decrease considerably, and device performance to improve significantly. The β-GaO/β-(AlGa)O/GaN n-type/Barrier/p-type photodetector achieves a photocurrent gain of 1246, responsivity of 237 A W, and specific detectivity of 5.23 × 10 cm Hz W under a bias of -20 V.
View Article and Find Full Text PDFToward Long-Life High-Voltage Aqueous Li-Ion Batteries: from Solvation Chemistry to Solid-Electrolyte-Interphase Layer Optimization Against Electron Tunneling Effect.
Adv Mater
December 2024
Department of Chemistry, Pohang University of Science and Technology (POSTECH), 37673, Pohang, Republic of Korea.
Water is pursued as an electrolyte solvent for its non-flammable nature compared to traditional organic solvents, yet its narrow electrochemical stability window (ESW) limits its performance. Solvation chemistry design is widely adopted as the key to suppress the reactivity of water, thereby expanding the ESW. In this study, an acetamide-based ternary eutectic electrolyte achieved an ESW ranging from 1.
View Article and Find Full Text PDFRevealing Single-Molecule Photocurrent Generation Mechanisms under On- and Off-Resonance Excitation.
Nano Lett
January 2025
Hefei National Research Center for Physical Sciences at the Microscale and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
We investigate photocurrent generation mechanisms in a pentacene single-molecule junction using subnanometer resolved photocurrent imaging under both on- and off-resonance laser excitation. By employing a wavelength-tunable laser combined with a lock-in technique, net photocurrent signals are extracted to elucidate photoinduced electron tunneling processes. Under off-resonance excitation, photocurrents are found to arise from photon-assisted tunneling, with contributions from three distinct frontier molecular orbitals at different bias voltages.
View Article and Find Full Text PDFStudy of AC Conductivity and Relaxation Times Depending on Moisture Content in Nanocomposites of Insulation Pressboard-Innovative Bio-Oil-Water Nanodroplets.
Materials (Basel)
November 2024
Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38a, Nadbystrzycka Street, 20-618 Lublin, Poland.
The aim of this study was to determine the frequency-temperature dependence of the AC conductivity and relaxation times in humid electrical pressboard used in the insulation of power transformers, impregnated with the innovative NYTRO BIO 300X bio-oil produced from plant raw materials. Tests were carried out for a composite of cellulose-bio-oil-water nanodroplets with a moisture content of 0.6% by weight to 5% by weight in the frequency range from 10 Hz to 5·10 Hz.
View Article and Find Full Text PDFEnhanced performance of hafnia self-rectifying ferroelectric tunnel junctions at cryogenic temperatures.
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December 2024
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, South Korea.
The advancement in high-performance computing technologies, including quantum and aerospace systems, necessitates components that operate efficiently at cryogenic temperatures. In this study, we demonstrate a hafnia-based ferroelectric tunnel junction (FTJ) that achieves a record-high tunneling electroresistance (TER) ratio of over 200,000 and decade-long retention characteristics. By introducing asymmetric oxygen vacancies through the strategic use of indium oxide (InO) layer, we enhance the TER ratio without increasing off-current, addressing the longstanding issue of low on-current in hafnia-based FTJs.
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