期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 69, 期 12, 页码 7033-7038出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3213527
关键词
Zinc oxide; II-VI semiconductor materials; Cooling; Transient analysis; Thermal conductivity; Thermal resistance; Temperature distribution; Average emission current; pulsed field emission; quasi-one-dimensional (Q1D) nanowire field emitter arrays (FEAs); self-heating; transient emission current; ZnO nanowire
资金
- National Key Research and Development Program of China [2016YFA0202000]
- NationalNatural Science Foundation of China [91833303]
- Science and Technology Department of Guangdong Province [2020B0101020002]
- Science and Technology Program of Guangzhou [202201011519]
- Fundamental Research Funds for the Central Universities
In this work, a model was established to study the transient emission current and temperature distribution of individual nanowires during pulsed field emission. Factors influencing the maximum transient emission current were investigated, and guidelines for improving the emission current in different applications were given. This study provides important insights for designing quasi-one-dimensional nanowire field emitter arrays.
Quasi-one-dimensional (Q1D) nanowire field emitter arrays (FEAs) have important applications in vacuum microelectronics. Investigation on its pulsed field emission characteristics is important for not only avoiding self-heating-induced vacuum breakdown but also achieving high emission current. In this work, a model for quantitative calculation of the transient emission current and temperature distribution of individual nanowire during pulsed field emission has been established by considering the time-dependent thermal conduction equation. Taking ZnO nanowire as an example, the influences of the pulsewidth, the nanowire length, the nanowire radius, and the electrical properties of nanowire on its maximum transient emission current have been investigated. Besides, the cooling process is found to be mainly related on the nanowire length when the nanowire temperature is below 1000 K. By calculating the average emission current under different pulsewidths and duty ratios, it is found that its maximum is determined by the maximum emission current in the steady state that the nanowire is self-heating steadily to the critical temperature below the melting point. Finally, discussions for improving the emission current in different potential applications of FEAs are given. The results provide guidelines for designing Q1D nanowire FEAs.
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