Current-Induced Thermal Tunneling Electroluminescence in a Single Highly Compensated Semiconductor Microrod

Cheng, Xing; Liu, Wei; Wang, Qiang; Xu, Chunxiang; Yan, Yinzhou; Jiang, Yijian

doi:10.1016/j.isci.2020.101210

Cited by 8 publications

(3 citation statements)

References 55 publications

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“…The other possibility is the thermal light emission due to Joule heating during the process, which can be defined as the thermal tunneling effect of nanostructures [ 40 ]. The emission and current response to bending deformation can be explained by the thermal properties of bending ZnO microwires [ 41 , 42 ]. The thermal potential field distribution along the microwire was simulated by using finite element analysis software ANSYS as exhibited in Figure 8 , here the simulation of microwire was established under the condition of equilibration at a constant temperature.…”

Section: Discussionmentioning

confidence: 99%

The Deformation Behavior and Bending Emissions of ZnO Microwire Affected by Deformation-Induced Defects and Thermal Tunneling Effect

Shi

Wang

et al. 2021

Sensors

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The realization of electrically pumped emitters at micro and nanoscale, especially with flexibility or special shapes is still a goal for prospective fundamental research and application. Herein, zinc oxide (ZnO) microwires were produced to investigate the luminescent properties affected by stress. To exploit the initial stress, room temperature in situ elastic bending stress was applied on the microwires by squeezing between the two approaching electrodes. A novel unrecoverable deformation phenomenon was observed by applying a large enough voltage, resulting in the formation of additional defects at bent regions. The electrical characteristics of the microwire changed with the applied bending deformation due to the introduction of defects by stress. When the injection current exceeded certain values, bright emission was observed at bent regions, ZnO microwires showed illumination at the bent region priority to straight region. The bent emission can be attributed to the effect of thermal tunneling electroluminescence appeared primarily at bent regions. The physical mechanism of the observed thermoluminescence phenomena was analyzed using theoretical simulations. The realization of electrically induced deformation and the related bending emissions in single microwires shows the possibility to fabricate special-shaped light sources and offer a method to develop photoelectronic devices.

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Section: Discussionmentioning

confidence: 99%

The Deformation Behavior and Bending Emissions of ZnO Microwire Affected by Deformation-Induced Defects and Thermal Tunneling Effect

Shi

Wang

et al. 2021

Sensors

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“…This membrane exhibits an H 2 permittivity rate of 5.0 × 10 −7 mol m 2 s −1 Pa −1 . Further, to enhance productivity rates, the prominently‐stable catalyst Pt−Rh/TiO 2 shows 95 % irreversible transformation of HI and retains activity for up to 200 h. These unexpected results were further improved by a membrane reactor‐based technique that proved conversion stability by a factor of 0.48, more significant than the equilibrium value of 0.22 [107] . Therefore, HI decomposition in the presence of active catalysts leads to hydrogen synthesis.…”

Section: Nanocomposites For Hydrogen Productionmentioning

confidence: 99%

Recent Breakthroughs and Future Potential of Inorganic Nanocomposites in Hydrogen Generation

Virender,

Priyanka,

Neeraj

et al. 2024

ChemistrySelect

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Green hydrogen synthesis has attracted researchers due to energy resource applications. Non‐renewable energy sources have been found to be incapable of meeting energy demands. Therefore, the need of the hour is to introduce an alternative to produce an efficient amount of H2. This review has summarized and investigated hetero‐catalysts and their hydrogen production potential under different light illuminations. Here, the syntheses of various nanoparticles (NPs) and composite semiconductors have been reviewed, and insights into the enhanced ability of noble‐free metal electrocatalysts have been provided. Specific nanomaterials, such as nickel, ruthenium, silver, boron‐doped SnO2, AgVO3, cobalt‐ferrite, and cobalt, dominate in synthesizing durable electrocatalysts. These exhibit Schottky junctions and enhance catalytic behaviour for hydrogen production. Finally, the challenges of the nanoparticle‘s structural and conductive properties and critical solutions are discussed. This review discusses mechanistic insights, interactions, and kinetics that involve a higher H2 synthesis rate.

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“…The regulation of V Zn and V O related defect concentrations achieved intrinsic color-tunable electroluminescence emission in a highly compensated ZnO microrod. The two and four potential channels of radiative recombination for free-electron-to-neutral-acceptor (FA) and DAP transition contributed to the EL emission energy [ 17 ]. Inspired by the reliable defect regulation of A-ZnO microtube, the effect of annealing temperature on the optoelectrical synapse behaviors of A-ZnO microtube was developed.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing temperature on the optoelectrical synapse behaviors of A-ZnO microtube

Pan,

Wang,

et al. 2024

Discover Nano

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Optoelectronic synapses with fast response, low power consumption, and memory function hold great potential in the future of artificial intelligence technologies. Herein, a strategy of annealing in oxygen ambient at different temperatures is presented to improve the optoelectronic synaptic behaviors of acceptor-rich ZnO (A-ZnO) microtubes. The basic synaptic functions of as-grown and annealed A-ZnO microtubes including excitatory postsynaptic current (EPSC), short-term memory (STM) to long-term memory (LTM) conversion, and paired-pulse facilitation (PPF), were successfully emulated. The results show that the annealing temperature of 600 °C yields high figures of merit compared to other annealed A-ZnO microtubes. The 4-fold and 20-fold enhancement dependent on the light pulse duration time and energy density have been achieved in the 600 °C annealed A-ZnO microtube, respectively. Furthermore, the device exhibited a PPF index of up to 238% and achieved four cycles of “learning-forgetting” process, proving its capability for optical information storage. The free exciton (FX) and donor–acceptor pair (DAP) concentrations significantly influenced the persistent photoconductivity (PPC) behavior of A-ZnO microtubes. Therefore, the LTM response can be controlled by the adjustment of numbers, powers, and interval time of the optical stimulation. This work outlines a strategy to improve the EPSC response through defect control, representing a step towards applications in the field of optoelectronic synaptic device.

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Current-Induced Thermal Tunneling Electroluminescence in a Single Highly Compensated Semiconductor Microrod

Cited by 8 publications

References 55 publications

The Deformation Behavior and Bending Emissions of ZnO Microwire Affected by Deformation-Induced Defects and Thermal Tunneling Effect

The Deformation Behavior and Bending Emissions of ZnO Microwire Affected by Deformation-Induced Defects and Thermal Tunneling Effect

Recent Breakthroughs and Future Potential of Inorganic Nanocomposites in Hydrogen Generation

Effect of annealing temperature on the optoelectrical synapse behaviors of A-ZnO microtube

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