On a numerical simulation of current-voltage features in wide range of temperature in metal/silicon Schottky diodes


Amiri P., ALTINDAL Ş.

Journal of Optoelectronics and Advanced Materials, vol.23, no.11-12, pp.605-611, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 11-12
  • Publication Date: 2021
  • Journal Name: Journal of Optoelectronics and Advanced Materials
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Page Numbers: pp.605-611
  • Keywords: Schottky diodes (SDs), Numerical Simulation, Series resistance effect on the intersection behavior forward bias I-V plots, Voltage dependent activation energy, CURRENT-TRANSPORT MECHANISMS, C-V CHARACTERISTICS, I-V, SERIES RESISTANCE, INTERSECTING BEHAVIOR, INTERFACE STATES, BARRIER HEIGHT, GAUSSIAN DISTRIBUTION, DEPENDENCE, GAAS
  • Gazi University Affiliated: Yes

Abstract

© 2021 National Institute of Optoelectronics. All rights reserved.In this work, the current-voltage behavior of metal/silicon Schottky structures is investigated numerically. The forward bias lnI-V plots for different values of series resistance Rs (0, 20, 50, 150 Ω) in various temperatures (40-300 K) are simulated using the iteration method. In this simulation, gold metal and n-type silicon semiconductors have been considered as contact and semiconductor interfacial materials. This type of Schottky structure is called a Schottky barrier diode. Comparison of electrical properties of Au/n-Si Schottky diodes and ideal Schottky diodes (SDs) indicates an abnormal behavior. The results show a crossing/intersection behavior at Rs=0. Considering the intersection points of each curve with other curves, it is clear that the slope of lnI-V plots is autonomous of temperature. The linear relation between voltage and current for Rs=0 show that the current or conductivity increases with the rise in temperature before the intersection region and then begins to decrease. Such a decrease in current despite the rise in temperature after intersection point is in nonconformity with the presented positive temperature coefficient of current. On the other hand, there isn't any intersection behavior in the lnI-V plots for Rs>0 and these plots begin to deviate from linearity for each temperature. The intersection of these curves is hidden and unobservable in homogeneous SDs because of the existence of series resistance. Arrhenius plots for Rs=0 and 150 Ω were also drawn and they show that the slope of these plots which is corresponding activation-energy (Ea) decreases with increasing voltage which indicated the Ea value is dependent on bias voltage as well as temperature. The enlarged view of the confluence region represents that the intersection of a pair of plots occurring at the varied voltage for various temperatures as almost qVi=ΦB+2KT/q.