Temperature dependence of n-type MOS transistors
- 1 March 1965
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electron Devices
- Vol. 12 (3), 142-148
- https://doi.org/10.1109/t-ed.1965.15470
Abstract
Ionization of surface states with increasing temperature is shown to be responsible for the positive temperature coefficient of the drain current often observed inn-type silicon MOS transistors. Competition of this effect with a decrease in mobility for increasing temperature is demonstrated to yield transistors with negative, positive, or zero temperature coefficients. The reflection of surface state ionization with increasing temperature as a linear decrease in gate voltage (for constant drain current) is theoretically explained. Since this linear decrease in gate voltage is a direct function of surface state density, a new method for determining the surface state density near the conduction band is developed. For many transistors gate voltage decreased about 40 millivolts per degree centigrade increase in temperature. This corresponds to a surface state density on the order of 1013per square centimeter per electron volt.Keywords
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