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TCAD photodiode (iv characteristics by using atlas) SILVACO TCAD

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idayasin

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HYE, CAN ANYONE HELP ME TO DETECT THE PROBLEM OF THIS CODING. I'M TRYING TO PLOT IV CHARACTERISTICS FOR PHOTODIODE, BUT THE GRAPH THAT HAD BEEN PRODUCED IS NOT SAME WITH THE THEORETICAL. THANKS

Code:
go atlas
mesh space.mult=1
x.mesh loc=0.00 spac=0.5
x.mesh loc=3.00 spac=0.1
x.mesh loc=5.00 spac=0.1
x.mesh loc=15.0 spac=0.1
x.mesh loc=17.00 spac=0.1
x.mesh loc=20.00 spac=0.5
#
y.mesh loc=20.00 spac=0.4
y.mesh loc=15.00 spac=0.1
y.mesh loc=10.00 spac=0.1
y.mesh loc=0.00 spac=0.4

region num=1 silicon

electr name=anode x.min=8.5 length=3
electr name=cathode1 x.min=0.5 length=2
electr name=cathode2 x.min=17.5 length=2

#.... N-epi doping 
doping n.type conc=1e19 x.min=0 x.max=20 y.top=0 y.bottom=20 uniform


#.... N+ doping 
doping n.type conc=1e18 x.min=3 x.max=17 y.top=0 y.bottom=15 uniform

#.... P-epi doping 
doping p.type conc=1e17 x.min=5 x.max=15 y.top=0 y.bottom=10 uniform

material material=silicon EG300=1.12 MUN=1100
material region=1 TAUN0=2e-7 TAUP0=1e-5
material name=base NC300=3e19

models bbt.kl trap.tunnel

method newton

struct outfile=simplegediode.str
tonyplot simplegediode.str

solve init
log outfile=simplegediode-iv.log
solve vanode=-3 vfinal=3 vstep=0.5 name=anode
tonyplot simplegediode-iv.log
quit
 
Last edited by a moderator:

which version of silvaco you are using?
 
Last edited by a moderator:

Hi idayasin,

Your carrier lifetime setup is looking very weird:
TAUN0=0.2 us TAUP0=10 us

For photodiodes general values are:
TAUN0=50E-6 TAUP0=50E-6
 

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