平面纳米自开关器件灵敏度的研究

Sensitivity of a Planar Nanoscale Self-Switching Device

运用二维系宗蒙特卡罗方法,模拟了平面纳米自开关器件的工作特性。结果表明,平面纳米自开关器件在加正向电压时是导通的,加负电压时是关闭的。但是在负偏压情况下并不是完全没有电流通过而是存在一不随电压变化的恒定漏电流。这使得电流电压关系曲线在零电压附近具有很强的非线性特性,因此可以把该器件运用于电磁波探测。通过多项式拟合方法获得了电流电压关系曲线的解析表达式,从而求得该器件的灵敏度。进一步分析表明通过改变表面态密度能够改变漏电流的大小,而小的漏电流有利于获得高的灵敏度。

Using two-dimensional ensemble Monte Carlo method,the working principle of a planar nanoscale self-switching device(SSD)was simulated.Calculation results show that the nano-channel of the SSD is opened at positive bias and closed at negative one.However,at negative bias there is a non-zero leakage current through the device,which does not change with the bias.This leakage current leads to a strong nonlinearity of the current-voltage characteristics at zero bias,which implies that the device may be used as a high sensitive detector for electromagnetic wave.Through fitting the simulation data with polynomial,the analytical expression of the current-voltage characteristics was obtained,so that the sensitivity of the SSD can be achieved.Further studies show that by adjusting the surface state density,the leakage current can be reduced resulting in a higher sensitivity.