Why the effect of temperature is different at on and off-state current?
For V(drain)=0.1V or 0.4V and V(gate)=0V, by increasing the temperature (300ºk, 400ºk, 500ºk) the current (off-state current) increases. Such behavior can be seen for V(drain)=0.4V and V(gate)=1V (on-state current). But for V(drain)=0.1V and V(gate)=1V the current decreases with temperature.
At low gate bias it’s common. By increasing the ambient temperature thermal leakage current over top of the potential barrier increases.(caries obtain enough energy for escaping from region under Fermi level of the source to top of the potential barrier).But for high gate field what is the reason of varying the current by temperature?
Why the effect of temperature on current is different for different bias conditions? Does it arise from scattering process? What scattering?
The structure was selected coaxial and all parameters for device and simulator setting were kept as default.