nmos simulation in Silvaco

[sam.mosfet]

Hi i want to make a quick nmos in silvaco, I was having trouble with it because i am pushed to use atlas for this project. I just want an atlas script to start with if any body would help me i would appreciate it. The whole script would nee to be in atlas only no athena

 

[dick_freebird]

Have you looked at the examples which ship with the
installation packages? There looks to be a lot of stuff
there, although I have not messed with the TCAD end
of it. Maybe you can find one with an NMOS structure
involved.

 

[sam.mosfet]

I have but they are all coded in athena none of them are atlas only.

 

[sam.mosfet]

set zwth=10
set taun=1e-6
set taup=1e-9
###########
go atlas
mesh space.mult=1.0 width=$zwth

x.mesh loc=0.0 spac=0.01
x.mesh loc=0.25 spac=0.01
x.mesh loc=1.0 spac=0.01
x.mesh loc=2.0 spac=0.005
x.mesh loc=2.5 spac=0.005
x.mesh loc=3.0 spac=0.005
x.mesh loc=3.25 spac=0.01
x.mesh loc=3.5 spac=0.01
x.mesh loc=4.0 spac=0.01


y.mesh loc=-0.11 spac=0.002
y.mesh loc=-0.1 spac=0.01
y.mesh loc=0.0 spac=0.005
y.mesh loc=0.02 spac=0.005
y.mesh loc=0.04 spac=0.005
y.mesh loc=0.06 spac=0.005
y.mesh loc=0.08 spac=0.005
y.mesh loc=0.8 spac=0.05
y.mesh loc=0.6 spac=0.05
y.mesh loc=1.0 spac=0.15

########Regions
region number=1 x.min=0 x.max=4 y.min=-0.11 y.max=0 material=Si3N4
###Channel
#region number=4 x.min=0.0 x.max=4.0 y.min=0.0 y.max=0.08 material=Si
####source and drain
region number=2 x.min=0.0 x.max=0.50 y.min=-0.05 y.max=0.0 material=Si
region number=3 x.min=3.5 x.max=4.0 y.min=-0.05 y.max=0.0 material=Si

#########Gate
region number=7 x.min=1.75 x.max=2.25 y.min=-0.1 y.max=-0.02 material=poly

####substrate
region number=5 x.min=0.0 x.max=4.0 y.min=0 y.max=1.0 material=Si

######Insulator
region number=6 x.min=1 x.max=3 y.min=-0.02 y.max=0 material=Si3N4

#####Electrodes
electrode name=source material=Aluminium x.min=0.0 x.max=0.5 y.min=-0.10 y.max=-0.045
electrode name=drain material=Aluminium x.min=3.50 x.max=4.0 y.min=-0.10 y.max=-0.045
electrode name=gate material=poly x.min=1.75 x.max=2.25 y.min=-0.1 y.max=-0.02

######Doping
doping uniform region=2 n.type conc=1e20
doping uniform region=3 n.type conc=1e20
doping uniform region=4 p.type conc=1e14
doping uniform region=5 p.type conc=1e14
doping uniform region=7 n.type conc=1e20
#doping uniform x.min=0.0 x.max=5.0 y.min=0.5 y.max=1.0 n.type conc=1e12

##### structure
save outf=GM_SiC.str
tonyplot GM_SiC.str
quit

I coded the above structure can somebody tell me if this structure is a valid NMOS structure before I start doing any simulation with it.

Thank you

 

[Colbhaidh]

Here is a very simple nmos

#nmos bulk mosfet Atlas only
go atlas

mesh space.mult=1.0
x.mesh loc=0.00 spac=0.01
x.mesh loc=0.05 spac=0.001
x.mesh loc=0.09 spac=0.004
x.mesh loc=0.13 spac=0.001
x.mesh loc=0.18 spac=0.01
y.mesh loc=-0.002 spac=0.0005
y.mesh loc=0.0 spac=0.0004
y.mesh loc=0.03 spac=0.008
y.mesh loc=0.10 spac=0.01

region num=1 y.min=0 silicon
region num=2 y.max=0 oxide

electrode name=gate number=1 x.min=0.05 x.max=0.13 top
electrode name=source number=2 left  length=0.05 y.min=0 y.max=0
electrode name=drain  number=3 right length=0.05 y.min=0 y.max=0
electrode name=substrate number=4 bottom

doping uniform conc=2.2e18 p.type region=1
doping uniform conc=1.0e20 n.type x.left=0.00 x.right=0.05 y.min=0 y.max=0.03
doping uniform conc=1.0e20 n.type x.left=0.13 x.right=0.18 y.min=0 y.max=0.03

workfunction=4.18eV
contact name=gate n.poly
contact name=source neutral
contact name=drain neutral
contact name=substrate neutral

models mos
mnethod newton trap

solve init
solve vdrain=0.1 outf=vdd0p1
solve vdrain=0.2 outf=vdd0p2
solve vdrain=0.3 outf=vdd0p3
solve vdrain=0.4 outf=vdd0p4

load infile=vdd0p1
log outf=rampgate
solve name=gate vgate=0 vfinal=1.5 vstep=0.1

tonyplot rampgate