Charge trapping device
A silicon based semiconductor device and method uses charge trapping to alter a density of carriers available in a channel of a field effect transistor (FET) for conduction. The charge trapping mechanism can be controlled by a source-drain bias voltages applied to the FET, so that the device can be turned off through a control mechanism separate from a gate voltage.
1. A method of operating a silicon based semiconductor device comprising the steps of:
(a) receiving a bias voltage across a channel region of the silicon based semiconductor device, said channel region being coupled to a source region and a drain region;
(b) trapping carriers in a dielectric layer located proximate to said channel region to cause a change in a density of carriers available for conduction in said channel region;
(c) adjusting said bias voltage to control a number of charge carriers removed by said dielectric layer from said channel region,
wherein the silicon based semiconductor device can be switched off using said bias voltage and without using a program and/or an erase cycle.
2. The method of claim 1 , further including a step:
applying a second bias voltage to a body of the silicon based semiconductor device to counter a trapping mechanism effect of said dielectric layer.
3. The method of claim 1 , wherein said channel region exhibits negative differential resistance.
4. The method of claim 1 , wherein conduction in said channel region can be continuously and dynamically varied between a negative differential resistance mode and a non-negative differential resistance mode.
5. The method of claim 1 , wherein said dielectric layer is configured such that said charge carriers are trapped only temporarily and such that a continuous trapping and detrapping mechanism is set up between said trapping layer and said channel region.
6. The method of claim 1 , wherein a threshold voltage of the silicon based semiconductor device is controlled by said bias voltage.
7. The method of claim 1 , wherein said silicon based semiconductor device also can be switched off using a gate bias voltage.
8. The method of claim 1 , wherein said silicon based semiconductor device is turned on using a separate gate bias voltage.