金属-氧化物结点三次谐波特性分析与实验研究

基于金属与金属氧化物接触的势垒模型和整流理论,从金属-氧化物结点的非线性伏安特性出发,分析了金属-氧化物结点在微波照射下的谐波再辐射特性及结点上产生的三次谐波电流分量的表达式。此外,从金属-氧化物自身的角度出发,经过详细的理论推导,讨论了金属-氧化物结点再辐射特性中影响三次谐波电流分量强弱的因素。理论结果表明,其它条件相同时,当金属与氧化物的接触面积较小,或者金属与氧化物接触面的势垒高度较大时,金属-氧化物结点上再辐射的三次谐波电流分量较弱。最后,通过实验测试验证,当金属与氧化物的接触面积减小或者金属与氧化物接触面的势垒高度增大时,金属-氧化物结点上的三次谐波分量明显减弱。

Analysis and Experiment Study of the Third Harmonic Characteristics of Metal-Oxide Junctions

Based on the barrier model and rectification theory of metal and metallic oxide contacts, and from the non-linear current-voltage characteristics of the contacts, the radiation characteristics of the contacts and the third harmonic component generated in the contacts under microwave irradiation are analyzed in this paper. In addition, from the perspective of metal and metallic oxide contacts, the factors which influence the radiation characteristics of the third harmonic current component are discussed through a detailed numerical analysis. Based on the theoretical results analysis, it has been found that when the contact area of the metal and the oxide layer goes smaller, or the barrier height between the metal and the oxide layer surface becomes larger, a smaller third harmonic can be obtained. At last, experimental results demonstrate that with the contact area of the metal and the oxide layer decreasing, or with the barrier height between the metal and the oxide layer surface increasing, the third harmonic attenuates significantly.