Department of Physics, Al-Nahrain University, Jadiriya 64055, Baghdad, Iraq.
ACS Nano. 2010 Oct 26;4(10):5585-90. doi: 10.1021/nn1008403.
Field emission measurements of current-voltage characteristics are reported for tetrapod structures of ZnO. The nonlinear Fowler-Nordheim (FN) plot is analyzed according to a model of calculation based on saturation of conduction band current and predominance of valence band current at high-field values. The simulated FN plot exhibits similar features to those observed experimentally. The model of calculation suggests that the slope variation of the FN plot, in the high-field and low-field regions, does not depend on the magnitude of saturation. Instead, it is a characteristic of the energy band structure and voltage-to-barrier-field conversion factor of the emitting material.
本文报道了 ZnO 四角形结构的电流-电压特性的场发射测量结果。根据基于传导带电流饱和和高场值下价带电流优势的计算模型，对非线性 Fowler-Nordheim（FN）图进行了分析。模拟的 FN 图表现出与实验观察到的相似特征。计算模型表明，FN 图在高场和低场区域的斜率变化与饱和的大小无关，而是发射材料的能带结构和电压-势垒场转换因子的特征。
