I have created SDE script and when simulated structur looks fine. But when moving to S Device I want to get I V Characteristics. I need help in creating the S Device command file and parameter file.
# sdevice.cmd
# Load the mesh file
File {
Grid = "n@node@_msh.tdr"
Plot = "n@node@_plt.tdr"
Output = "n@node@_des.tdr"
}
# Define physical models
Physics {
Mobility( HighFieldSaturation )
Recombination( SRH Auger )
EffectiveIntrinsicDensity( OldSlotboom )
Fermi
Poisson
ElectronTemperature
HoleTemperature
ImpactIonization
}
# Define solution methods
Math {
Extrapolate
RelErrControl
Iterations = 50
Notdamped = 50
Autostep
Coupled { Iterations = 30 }
}
# Define contacts
Contact {
{ Name = "gate" Voltage = 0.0 }
{ Name = "drain" Voltage = 0.0 }
{ Name = "substrate" Voltage = 0.0 }
}
# Define the breakdown simulation
Solve {
Coupled { Poisson Electron Hole }
Quasistationary (
{ Name = "drain" Voltage = 0.0 }
{ Name = "drain" Voltage = 10.0 Step = 0.1 }
)
Save ( File = "n@node@_des.tdr" )
}
# Plot the results
Plot {
Output = "n@node@_plt.tdr"
Potential
ElectricField
CurrentDensity
ImpactIonizationRate
}
# sdevice.par
# Material parameters for GaN
Material = "GaN" {
BandGap = 3.4
Permittivity = 9.0
ElectronAffinity = 4.1
Mobility( Electrons = 1000 Holes = 30 )
EffectiveDensityOfStates( ConductionBand = 2.2e18 ValenceBand = 4.6e19 )
ImpactIonization( Electrons = "GaN_II" Holes = "GaN_II" )
}
# Material parameters for AlN
Material = "AlN" {
BandGap = 6.2
Permittivity = 8.5
ElectronAffinity = 1.9
Mobility( Electrons = 300 Holes = 10 )
EffectiveDensityOfStates( ConductionBand = 4.4e18 ValenceBand = 8.2e19 )
ImpactIonization( Electrons = "AlN_II" Holes = "AlN_II" )
}
# Material parameters for AlGaN
Material = "AlGaN" {
BandGap = 4.0
Permittivity = 8.8
ElectronAffinity = 3.0
Mobility( Electrons = 800 Holes = 20 )
EffectiveDensityOfStates( ConductionBand = 3.0e18 ValenceBand = 6.0e19 )
ImpactIonization( Electrons = "AlGaN_II" Holes = "AlGaN_II" )
}
# Impact ionization models
Model = "GaN_II" {
ImpactIonization( Electrons = "Selberherr" Holes = "Selberherr" )
Parameters = {
An = 2.9e7 Bn = 1.8e8
Ap = 2.0e7 Bp = 1.6e8
}
}
Model = "AlN_II" {
ImpactIonization( Electrons = "Selberherr" Holes = "Selberherr" )
Parameters = {
An = 1.5e7 Bn = 2.0e8
Ap = 1.0e7 Bp = 1.8e8
}
}
Model = "AlGaN_II" {
ImpactIonization( Electrons = "Selberherr" Holes = "Selberherr" )
Parameters = {
An = 2.2e7 Bn = 1.9e8
Ap = 1.5e7 Bp = 1.7e8
}
}
# Define doping profiles
Doping = "UniformDonorDoping" {
Concentration = 5e17
Type = Donor
}
Doping = "Const.GaNCap" {
Concentration = 3e18
Type = Donor
}
# Define contact properties
Contact = "gate" {
WorkFunction = 4.7
}
Contact = "drain" {
WorkFunction = 4.7
}
Contact = "substrate" {
WorkFunction = 4.7
}
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