An investigation on temperature effect of the home-made pMOS RADFETs used in dosimeters has been carried out. Based on the theoretical formulas of MOS transistor threshold voltage and the I DS - V GS equation
the temperature effects on threshold voltage and channel carrier mobility are discussed. And the influence of irradiation on the “zero temperature coefficient(ZTC) point” is explored. The experimental results show that biasing a pMOS dosimeter at ZTC point (constant current) to measure the gate-source voltage can improve the read-out precision of the dosimeter and make compensation for the temperature effect.