Insulator Trap Induced Measurement Sweep Hysterisis

tftex12.in : Insulator Trap Induced Measurement Sweep Hysterisis

Requires: SSuprem 4/Blaze/TFT
Minimum Versions: Athena 5.22.3.R, Atlas 5.28.1.R

This example shows the effect of measurement time on the results obtained for typical TFT DC I-V measurements. For some TFT devices, where the insulator contains traps that are within communication distance of the semiconductor channel, the time and bias dependent trapping and de-trapping events create a hysterisis effect in the IV curves. The time dependency of the insulator trapping and de-trapping events, creates a hysterisis effect, the magnitude of which depends on the time taken to take the measurements.

In order to greatly simplify the time dependency simulation of insulator trap induced effects, the device simulator has incorporated the Heiman model which is invoked by specifying the "heiman" parameter in the inttrap statement. The Heiman model allows the simulation of insulator trap time dependency effects using simple DC solve statements. The maximum effective communication distance of the insulator traps with the semiconductor channel, is specified using the depth parameter in the "inttrap" statement. The depth resolution of the insulator traps is specified by the hpoints parameter in the inttrap statement. Other than these Heiman related parameters, the rest of the inttrap statement is exactly the same as a normal inttrap statement.

All that remains to take account of the measurement time dependency effects, caused by the insulator traps, is to specify the total measurement time on the solve statement. This is done using the timespan parameter on the solve statement. In this particular example, the "timespan" parameter is set as a variable called measurementtime at the begining of the Atlas section of the input file, so that the input file can be easily modified to create a design of experiments using the measurement time as a variable.

To load and run this example, select the Load button in DeckBuild > Examples. This will copy the input file and any support files to your current working directory. Select the Run button in DeckBuild to execute the example.