Current transport properties of (Au/Ni)/HfAlO3/n-Si metal-insulator-semiconductor junction

Arslan E., Badali Y., Aalizadeh M., ALTINDAL Ş. , Ozbay E.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol.148, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 148
  • Publication Date: 2021
  • Doi Number: 10.1016/j.jpcs.2020.109758


In this study, HfAlO3 ternary alloy thin film was grown on n-type silicon using the atomic layer deposition method. The current transport mechanisms in the (Au/Ni/HfAlO3/n-Si junction were examined over a wide temperature range (80-360 K). The values obtained for the ideality factor (n) varied from 22.93 to 3.94 and the barrier height at zero bias (Phi(B0)) ranged from 0.221 eV to 0.821 eV as the temperature changed from 80 to 360 K. The Phi(B0)-n and Phi B-30-q/2 kT characteristics were investigated to explain the higher n values and non-ideal behavior of the Richardson curves. Two linear regions were found at low temperatures (LTs; 80-180 K) and high temperatures (HTs; 200-360 K), which indicated the presence of a Gaussian distribution barrier height and the average barrier heights ((Phi) over bar (B0)) were identified. The values obtained for (Phi) over bar (B0 )were 0.734 eV for LTs and 1.125 eV for HTs, and the values of sigma(s) were 0.085 V for LTs and 0.140 V for HTs. The values obtained for N-ss decreased as the temperature increased and they varied between similar to 10(12) and 10(13) eV(-1) cm(-2). Finally, the dielectric behavior and conductivity of the (Au/Ni)/HfAlO3/n-Si junction were investigated at frequencies between 5 kHz and 2 MHz at room temperature. The values determined for epsilon' and epsilon '' at -1 V and 5 kHz were 2.1 and 3.53, respectively.