Negative Series Resistance (Rs) and Real Part of Impedance (Z′), and Positive and Negative Imaginary Part of Impedance (Z″) at a High Frequency of Au/CNTS/n-Si/Al Structure

Abstract

Here in this article, presented negative values of series resistance (Rs), the negative real part of impedance (Z″), the positive and negative values of imaginary part of impedance (Z″) seemed at high frequency for all voltages, temperatures and frequencies of Au/CNTS/n-Si/Al. At all frequencies the Rs has positive values, increase with decreasing frequencies except at frequency 2 × 107 Hz (Rs) has negative values reached to about −5200 Ω. At f = 2 × 107 Hz Z″ has negative values reached to −0.5 Ω and at other frequencies, the Z″ has positive values, growth with decreasing frequency. The Z″ has positive values at frequencies (2 × 107, 1 × 107, 1 × 103, 1 × 102, 10) Hz, whilst at frequencies (1 × 106, 1 × 105, 1 × 104) Hz the Z″ has negative values. At high frequencies, this assembly Au/CNTS/n-Si/Al behaves as a tunneling diode has negative resistance. At other frequencies this structure Au/CNTS/n-Si/Al behaves as a normal diode, and negative resistance is disappeared. So this structure Au/CNTS/n-Si/Al is applied as tunneling diode at high frequency and normal diode by changing of frequencies. The electrical properties and conduction mechanism of this structure were investigated.