表面电荷
波克尔效应
电介质
指数衰减
电子
电荷密度
电极
材料科学
离子
电荷(物理)
化学
分子物理学
分析化学(期刊)
原子物理学
电压
光电子学
物理
有机化学
物理化学
色谱法
量子力学
核物理学
作者
Ting Li,Huijie Yan,Siqi Yu,Yuying Wang,Jiaqi Li,Jian Song,Quan‐Zhi Zhang
摘要
The surface charge distribution in a surface dielectric barrier discharge driven by repetitive pulse bias superimposed on AC voltage is measured using the Pockels effect of an electro-optic crystal. The impact of surface charge on surface-breakdown characteristics is investigated by varying the phase of the pulse superimposition. It is demonstrated that the surface charge accumulation varies at different superimposition phases depending on the potential difference between the two electrodes. The accumulated positive/negative surface charge will facilitate the following surface discharge when the AC voltage polarity changes. In addition, different spatiotemporal characteristics of the surface charge distribution are presented when changing the polarity of superimposed pulses. Positive surface discharges are usually easier to develop than negative surface discharges due to their lower breakdown voltage caused by the accumulation of negative surface charges near the edges of exposed electrodes. The decay of positive surface charge is dominated by neutralization of negative surface charge and negatively charged particles (free electrons and negative ions) from the volume above the dielectric. There are two decay modes of positive surface charge: exponential decay and linear decay.
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