Vol. 43, Issue 1, pp. 35-38

  1. Archive
  2. Optica Applicata Vol. 43, Issue 1, pp. 35-38 (2013)
Vol. 43 Issue 1 pp. 35-38

Measurements of AlGaN/GaN heterostructures for sensor applications

Mikolaj Ryszard Hojko, Dorota Paszuk, Bogdan Paszkiewicz

Keywords

sensor, AlGaN/GaN heterostructure, electrolyte, two-dimensional electron gas (2DEG), pH

Abstract

In the paper, the behavior of AlGaN/GaN HEMT-type heterostructures in a water solution of (KOH + HCl) with differing pH was studied. The influence of the electrolyte pH on channel pinch-off voltage was measured using impedance spectroscopy methods. It was observed that  the change of the pH of electrolyte has a strong effect on the pinch-off voltage of AlGaN/GaN HEMT-type heterostructures independently of the concentration of other ions. In high-pH environment the so-called memory effect of heterostructures was revealed. Its possible origin was discussed. A general theory to explain all results was proposed.

Vol. 43
Issue 1
pp. 35-38

0.33 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology