三量子阱超晶格单元结构电流特性的数值研究

Numerical Study of Voltage-Current Characteristics in a Three-Quantum-Well Superlattice Unit

通过数值求解非平衡态维格纳函数,研究了三量子阱(three-quantum-well)超晶格单元结构共振隧穿电压-电流特性.计算结果表明:增大阱宽,减小垒宽或势垒高度可使峰值电流对应电压逐渐增加,电流峰值逐渐增大;增加掺杂浓度或降低温度可使电流峰值增大,而对应电压值保持不变.

Voltage-current characteristics in a three-quantum-well superlattice unit are studied by numerically solving the nonequilibrium Wigner function equation. The calculation results show that the peak value of current and it＇ s corresponding voltage will increase with increasing well-width, decreasing barrier-width or barrier-height; the peak value of current will increase with increasing doping concentration or decreasing temperature while it＇s corresponding voltage hold the line.