lib/template/mosstr2.tcl

   1 #-------------------
   2 #  mosstr1
   3 #-------------------
   4 #  Template File for MOS Structures
   5
   6 puts "Generate GSS input file..."
   7
   8 #COMMENT   Derived Quantities and Definitions
   9 #    WD       = depletion width under the drain (microns)
  10 #    SUBDEP   = substrate depth (microns)
  11 #    LMID     = distance to middle
  12 #               of gate from source edge (microns)
  13 #    LMAX     = width of device (microns)
  14 #    EPS      = roundoff error
  15 set WD        [expr 3.6E7*sqrt((.8+abs($VDBMAX))/$NSUB)]
  16 set SUBDEP    [expr int(2*($SDJUNC+$WD+1.5))/2]
  17 set LMID      [expr $LSOURCE+$LGATE/2]
  18 set LMAX      [expr $LSOURCE+$LGATE+$LDRAIN]
  19 set EPS       [expr 0.0002]
  20
  21 #COMMENT   Only consider LDD implants if LDDPEAK >= NSUB.
  22 #         LDT ==> LDD implant
  23 #         LDF ==> No LDD implant
  24 if {$LDDPEAK>$NSUB} {
  25   set LDT  1
  26   set LDF  0
  27 } else {
  28   set LDT  0
  29   set LDF  1
  30 }
  31
  32 #COMMENT   Transistor type.
  33 if  {$TRANTYPE == "PMOS"} {
  34   set NMOS  0
  35   set PMOS  1
  36 } else {
  37   set NMOS  1
  38   set PMOS  0
  39 }
  40
  41 #COMMENT   Threshold implant impurity type.
  42 if {$VTTYPE == "N"} {
  43   set VTN  1
  44   set VTP  0
  45 } else {
  46   set VTN  0
  47   set VTP  1
  48 }
  49
  50
  51 #COMMENT   More Derived Quantities
  52 #    SDDIF    = source/drain out-diffusion distance (microns)
  53 #    LDDIF    = lightly doped drain out-diffusion
  54 #               distance (microns)
  55
  56 set NSRF  [expr $NSUB+$VTPEAK]
  57 if {$NMOS && $VTN} { set NSRF  [expr abs($NSUB-$VTPEAK)]}
  58 if {$PMOS && $VTP} { set NSRF  [expr abs($NSUB-$VTPEAK)]}
  59
  60 set NSDJ  [expr $NSUB]
  61 set TMP   [expr $VTPEAK*exp(- pow($SDJUNC/$VTCHAR,2))]
  62 if {$NMOS && $VTP} { set NSDJ  [expr $NSUB+$TMP]}
  63 if {$PMOS && $VTN} { set NSDJ  [expr $NSUB+$TMP]}
  64 set SDYC  [expr $SDJUNC/sqrt(log($SDPEAK/$NSDJ))]
  65 if {$LDT} {set NLDJ  [expr $NSUB]}
  66 if {$LDT} {set TMP   [expr $VTPEAK*exp(- pow($LDDJUNC/$VTCHAR,2))]}
  67 if {$LDT && $NMOS && $VTP} {set NLDJ  [expr $NSUB+$TMP]}
  68 if {$LDT && $PMOS && $VTN} {set NLDJ  [expr $NSUB+$TMP]}
  69 if {$LDT} {set LDYC  [expr $LDDJUNC/sqrt(log($LDDPEAK/$NLDJ))]}
  70
  71 set FileID [open $FileName w]
  72 puts "Write GSS input statements to $FileName"
  73
  74 #-----------------------
  75 #  MESH GENERATION
  76 #-----------------------
  77 puts $FileID "MESH   Type=GSS   ModelFile=$TRANTYPE.cgns Triangle=pzAY"
  78 puts $FileID "XMESH  WIDTH=$LSCONT           N.SPACES=[expr int($LSCONT/0.1)]"
  79 puts $FileID "XMESH  WIDTH=$LSOURCE-$LSCONT  N.SPACES=[expr int(($LSOURCE-$LSCONT)/0.1)]"
  80 puts $FileID "XMESH  WIDTH=$LGATE/2          N.SPACES=[expr int($LGATE/0.2)]"
  81 puts $FileID "XMESH  WIDTH=$LGATE/2          N.SPACES=[expr int($LGATE/0.2)]"
  82 puts $FileID "XMESH  WIDTH=$LDRAIN-$LDCONT   N.SPACES=[expr int(($LDRAIN-$LDCONT)/0.1)]"
  83 puts $FileID "XMESH  WIDTH=$LDCONT           N.SPACES=[expr int($LDCONT/0.1)]"
  84
  85 puts $FileID "YMESH  Y.TOP=0.1+$TOX  Y.BOTTOM=$TOX  N.SPACES=1"
  86 puts $FileID "YMESH  Y.BOTTOM=0.0    N.SPACES=1"
  87 puts $FileID "YMESH  DEPTH=$SDJUNC   H1=$SDJUNC/8  H2=$SDJUNC/4"
  88 puts $FileID "YMESH  DEPTH=1-$SDJUNC H1=$SDJUNC/4  H2=0.2"
  89 puts $FileID "YMESH  Y.BOTTOM=-$SUBDEP  H1=0.2  RATIO=1.2"
  90 puts $FileID "YMESH  Y.BOTTOM=-$SUBDEP-0.1  N.SPACES=1"
  91
  92 puts $FileID "ELIMINATE  Direction=COLUMNS  Y.TOP=-1.5"
  93
  94 #-----------------------
  95 #  REGIONS
  96 #-----------------------
  97 puts $FileID  "#---------------------------------------------------"
  98 puts $FileID  "REGION  Label=Silicon  Material=Si"
  99 puts $FileID  "REGION  Label=Oxide    Material=Ox  IY.MAX=2"
 100
 101 #-----------------------
 102 #  ELECTRODES
 103 #-----------------------
 104 puts $FileID  "REGION  Label=Drain   IY.MAX=2  X.MIN=$LMAX-$LDCONT Material=Elec"
 105 puts $FileID  "REGION  Label=Gate    IY.MAX=1  X.MIN=$LSOURCE  X.MAX=$LSOURCE+$LGATE Material=Elec"
 106 puts $FileID  "REGION  Label=Source  IY.MAX=2  X.MAX=$LSCONT Material=Elec"
 107 puts $FileID  "REGION  Label=Substrate  Y.MAX=-$SUBDEP+0.0001 Material=Elec"
 108
 109 #-----------------------
 110 #  PROFILES
 111 #-----------------------
 112 if {$VTTYPE == "P"}  {
 113   set VTTYP   "Acceptor"
 114 }  else {
 115   set VTTYP   "Donor"
 116 }
 117 if {$NMOS} {
 118  set SDTYP   "Donor"
 119  set SUBTYP  "Acceptor"
 120 }
 121 if {$PMOS} {
 122  set SDTYP   "Acceptor"
 123  set SUBTYP  "Donor"
 124 }
 125
 126
 127 #-----------------------
 128 #  ANALYTIC PROFILES
 129 #-----------------------
 130 puts $FileID  "PROFILE  Ion=$SUBTYP  N.PEAK=$NSUB  Type=Uniform  X.MIN=0.0  X.MAX=$LMAX Y.TOP=0.0 Y.BOTTOM=-$SUBDEP"
 131 if {$VTPEAK > 1.0} {
 132     puts $FileID  "PROFILE  Type=Gauss Ion=$VTTYP  N.PEAK=$VTPEAK  Y.CHAR=$VTCHAR X.MIN=0.0  X.MAX=$LMAX"
 133 }
 134 if {$LDT} {
 135   puts $FileID  "PROFILE  Type=Gauss Ion=$SDTYP  N.PEAK=$LDDPEAK  Y.CHAR=$LDYC X.CHAR=[expr $LATD*$LDYC] \
 136                           X.MIN=0.0  X.MAX=$LSOURCE"
 137   puts $FileID  "PROFILE  Type=Gauss Ion=$SDTYP  N.PEAK=$LDDPEAK  Y.CHAR=$LDYC X.CHAR=[expr $LATD*$LDYC] \
 138                           X.MIN=[expr $LMAX-$LDRAIN]  X.MAX=[expr $LMAX-$LDRAIN+$LDRAIN]"
 139 }
 140
 141 puts $FileID  "PROFILE  Type=Gauss Ion=$SDTYP  N.PEAK=$SDPEAK  Y.CHAR=$SDYC  X.CHAR=[expr $LATD*$SDYC] \
 142                         X.MIN=0.0  X.MAX=[expr $LSOURCE-$LSPACER]"
 143 puts $FileID  "PROFILE  Type=Gauss Ion=$SDTYP  N.PEAK=$SDPEAK  Y.CHAR=$SDYC  X.CHAR=[expr $LATD*$SDYC] \
 144                         X.MIN=[expr $LMAX-$LDRAIN+$LSPACER]  X.MAX=[expr $LMAX-$LDRAIN+$LSPACER+$LDRAIN-$LSPACER]"
 145
 146
 147 #-----------------------
 148 #  REGRIDS
 149 #-----------------------
 150 # Doping regrids
 151 puts $FileID  "REFINE   Variable=Doping Measure=SignedLog Dispersion=3  Triangle=praz"
 152
 153 # Potential regrids
 154
 155
 156 #-----------------------
 157 #  PLOTS
 158 #-----------------------
 159 puts $FileID  "#---------------------------------------------------"
 160 puts $FileID  "PLOT Variable=DeviceMesh"
 161
 162 #-----------------------
 163 #  Boundary Conditions
 164 #-----------------------
 165 #  WF   =  Work Function (V)
 166 if {$GATE == "PPoly"} {
 167  set WF 5.25
 168 } elseif {$GATE == "NPoly"} {
 169  set WF 4.17
 170 } elseif {$GATE == "Al"} {
 171  set WF 4.15
 172 }
 173
 174 puts $FileID  "#---------------------------------------------------"
 175 puts $FileID  "BOUNDARY Type = InsulatorInterface ID = IF_Oxide_to_Silicon QF=0"
 176 puts $FileID  "CONTACT  Type = GateContact        ID = Gate        WorkFunction=$WF"
 177 puts $FileID  "CONTACT  Type = OhmicContact       ID = Substrate"
 178 puts $FileID  "CONTACT  Type = OhmicContact       ID = Source"
 179 puts $FileID  "CONTACT  Type = OhmicContact       ID = Drain"
 180
 181 #-----------------------
 182 #  PLOTS
 183 #-----------------------
 184 puts $FileID  "#---------------------------------------------------"
 185 puts $FileID  "PLOT Variable=DeviceMesh"
 186
 187 #-----------------------
 188 #  Solve Equilibrium State
 189 #-----------------------
 190 puts $FileID  "METHOD   Type = DDML1   Scheme = Newton  NS=Basic LS=GMRES"
 191 puts $FileID  "SOLVE    Type = TRANSIENT TStart = 0 TStep=1e-11  TStop = 3e-10"
 192 puts $FileID  "SOLVE    Type = EQUILIBRIUM"
 193 puts $FileID  "PLOT     Variable=Na        Resolution=RES.High    AzAngle=120  ElAngle=60"
 194 puts $FileID  "PLOT     Variable=Nd        Resolution=RES.High    AzAngle=120  ElAngle=60"
 195 puts $FileID  "PLOT     Variable=Potential Resolution=RES.High    AzAngle=240  ElAngle=20"
 196 puts $FileID  "PLOT     Variable=ElecDensity      Resolution=RES.High    AzAngle=240  ElAngle=20"
 197 puts $FileID  "PLOT     Variable=HoleDensity      Resolution=RES.High    AzAngle=240  ElAngle=20"
 198 puts $FileID  "EXPORT   CoreFile = $TRANTYPE.init.cgns"
 199 puts $FileID  "END"
 200
 201
 202 close $FileID
 203
 204