Determination of temperature sensitivity and current-transport mechanisms of the GaAs-based MS contact

Kaymaz A., EVCİN BAYDİLLİ E., Tecimer H., Uslu Tecimer H., ALTINDAL Ş.

Materials Today Communications, vol.35, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 35
  • Publication Date: 2023
  • Doi Number: 10.1016/j.mtcomm.2023.106380
  • Journal Name: Materials Today Communications
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Keywords: Current-transport mechanisms (CTMs), Deviation from TE, Double Gaussian distribution, GaAs-based devices, MS contacts, Temperature sensors
  • Hakkari University Affiliated: Yes


In this study, the GaAs-based metal-semiconductor (MS) contact was prepared as a reference sample for comparison with other devices in the literature, especially some interfacial layered Schottky structures and temperature sensors. The study also includes investigating and evaluating essential device parameters for determining current-transport mechanisms (CTMs) and temperature-sensing behavior. In fact, the benefits of the insulator/organic interfacial layer in devices, such as controlling charge transfers and preventing diffusion at the MS interface, have been mentioned a lot in the literature. However, since the production processes of the MS contact are easier and less costly than interfacial-layered devices, it would be more logical/suitable to prefer it in applications where this device may be sufficient, especially as a temperature sensor. Therefore, the current-voltage (I-V) data of the produced MS contact was obtained in a wide temperature range to determine the CTMs, and it was observed that two linear areas with different slopes, known as the two-parallel diode model, existed in the GaAs-based MS contact. Therefore, essential contact parameters and graphs were obtained for both two regions, and it was obtained that quantum mechanical tunneling mechanisms, the T0 effect, and the Double Gaussian Distribution (DGD) with Thermionic Emission theory play a role as CTMs of the GaAs-based MS contact such as some interfacial layered devices given in the literature. On the other hand, the temperature sensitivity of the MS contact was examined, and it was observed that the sensitivity parameter values exhibit an excellent quality sensing behavior compared to other devices in the literature, including devices with high-temperature sensitivity. Therefore, it can be preferred as a temperature sensor in many applications due to its low cost and easy production processes.