The TFET device functions as expected for standalone simulations with the qtregion defined. However when trying to implement single transistor inverter with same qtregion the simulations stops with the following error.

"Error : problem with QTREGION: Number of tunnelling points".

I am posting my code outline for reference. Need suggestions on ways to remove this error and get the inverter simulations running.

# Device structure code file saved as tfet.str

vin 1 0 0

an 2=drain 1=gate 0=source infile=tfet.str

r1 2 4 100k

vcc 4 0 1.

vg 1 0 0.

c1 2 0 3ff

.dc vin 0. 1.2. 0.1

.end

contact device=an name=source workfunction=

contact device=an name=gate workfunction=

contact device=an name=drain workfunction=

material device=an ..............................

qtregion device=an number=1 ....................................

models device=an region=3 consrh cvt kla auger fermi qtunn.dir=xdir bbt.nonlocal print

go atlas

tonyplot tfet1.log