摘要
用全带 Monte Carlo方法模拟了纤锌矿 Zn O材料电子的稳态和瞬态输运特性 .稳态输运特性包括稳态平均漂移速度 -电场特性、电子平均能量 -电场特性和在不同电场下电子按能量的分布 .在平均漂移速度 -电场特性中发现了微分负阻效应 .Zn O的瞬态输运特性包括平均漂移速度 -位移关系曲线、渡越时间 -位移关系曲线等 .在平均漂移速度 -位移关系曲线中发现了过冲现象 ,这种现象是电子从低能谷到高能谷跃迁过程中的弛豫时间产生的 .
The full band Monte Carlo method is used to explore steady-state electron transport and transient electron transport in ZnO.For the steady-state electron transport,the velocity-field characteristics,average energy-field characteristics and electron distributions in energy are presented.An important feature of the velocity-field characteristics is a differential negative resistance effect in steady state electron drift velocity.For the transient electron transport,velocity-distance characteristics and transit time-distance characteristics are reported.In velocity-distance characteristics,the effect of velocity overshoot is found.Relaxation time of electron transfer from lower valleys to higher valleys causes the overshoot effect.
基金
国家留学基金资助项目 (批准号 :98813 0 5 4)~~
