Hello Dear Meshkini,

Please make use of the below formula:

extract name="nsubvt" 1.0/slope(maxslope(curve(abs(v."gate"),log10(abs(i."drain")))))

Hello Dear Molaei, thanks for your reply

I found this formula when I searched for tips to extracting the subthreshold slope with Silvaco software and I see the use of it, in mos1ex10.in

Now I have several questions and I would be glad help me to find Resp. :

1-I want to calculate the subthreshold swing , what is the difference between S swing and S slope?

2-What is the role of Slope and maxslope in the above formula?

3-I have simulated a tunneling fet and plot Log(Id)-Vgs graph and then use the above formula to extract SS parameter, the result was equal to 0.166.

what is the meaning of it? , is subthreshold swing 166 mV/dec or no?

Best Regards

Hello Dear Dr. Meshkin,

1- In the first place in order to find the main difference between the point subthreshold slope and (SSp) average subthreshold slope (SSavg) please read the below paper. This paper completely described this subject in one paragraph by 2D numerical simulations.

http://ieeexplore.ieee.org/document/6482880/

2- It is worth mentioning that the role of both of the slope and maxslope is completely related to the subthreshold slope formula and comprehensively described in the below links:

https://nanohub.org/resources/11769/reviews

or

ttps://nanohub.org/resources/11770/download/Device_Extraction.pdf

3-As you mentioned, the extracted values of the Silvaco TCAD are based on V/decade unit, but in order to use the extrapolated values in your upcoming papers, you should just multiply this value to 1000. Afterward, you have a nanoscale semiconductor devices with 166 mV/decade SSavg. As we know that the SS is one the important metrics of short channel effect which help to reduce the ultimate power supply (Vdd) of the nanoscale transistor. 

Hello Dear  Meshkin,  Mr. Rouzbeh Molaei Imen Abadi is suggesting in right direction. In Silvaco examples, point SS extraction method( or code)   is  given. We have also  preferred  the same. 

 Dear, you should also see average subthreshold  slope  for your  work.  I am  busy, weekend  of this  week, I will  try to  provide you some information. Can you please tell  me your  mail id?

http://link.springer.com/article/10.1007/s10825-016-0936-9/fulltext.html

Formula for Average subthreshold slope is  give  in above  articel

http://www.nature.com/nature/journal/v479/n7373/pdf/nature10679.pdf

Dear Molaei and Shiromani, thanks for your valuable advices and tips.

At first, I will study the papers and links that you send, and then I will ask my related questions.

my Email ID:  [email protected]

Best Regards

Hello Dear Molaei,

I read the ieee paper that you linked above, I saw the formula for average subthreshold swing but I couldn,t find the main difference between the subthreshold swing and subthreshold slope, are you mean the "Electrical characteristics of DMG-NTFET" paragraph?

subthreshold slope is the reciprocal of subthreshold swing. You can understand it by checking out the unit of subthreshold swing (mV/Decade).