Abstract
Variation of temperature, pressure, and pH values has been demonstrated for affecting the stability of AlGaN/GaN HEMTs sensors. In addition to the factors above mentioned, we found out other factors which are related to the stability of AlGaN/GaN HEMTs sensors. In this study, we found out the current variation of AlGaN/GaN HEMTs without gate metal sensors is inversely proportional to the viscosity of liquids. We also found out that dipole moment of liquids is related to the current variation of AlGaN/GaN HEMTs without gate metal sensors. © The Electrochemical Society.