silvaco软件学习器件仿真遇到困难 求指点

撩拨懵懂

go atlas
mesh
#
x.m l=0.0 spacing=1
x.m l=4.0 spacing=1
x.m l=8.0 spacing=1
x.m l=10.0 spacing=1
x.m l=11.0 spacing=0.4
x.m l=19.0 spacing=0.4
x.m l=20.0 spacing=1
x.m l=22.0 spacing=1
x.m l=26.0 spacing=1
x.m l=30.0 spacing=1
#
y.m l=0.0 spacing=3.0
y.m l=0.15 spacing=0.5
y.m l=0.5 spacing=3.0
y.m l=3.0 spacing=4
y.m l=5.0 spacing=4
region num=1 material=silicon
electrode name=anode x.min=15 length=1 y.min=-0.5 y.max=0.0
electrode name=cathode x.min=5.5 length=1 y.min=-0.5 y.max=0.0
electrode name=cathode x.min=23.5 length=1 y.min=-0.5 y.max=0.0
#....p-epi doping
doping uniform p.type conc=1.21e15
#....dnw doping
doping uniform n.type conc=1.28e17 x.min=4 x.max=26 y.min=0.0 y.max=3.0
#....pw doping
doping uniform p.type conc=1e17 x.min=8 x.max=11 y.min=0.0 y.max=0.5
doping uniform p.type conc=1e17 x.min=19 x.max=22 y.min=0.0 y.max=0.5
#....p+ doping
doping uniform p.type conc=5e19 x.min=10 x.max=20 y.min=0.0 y.max=0.15
doping uniform p.type conc=5e19 x.min=1.5 x.max=2.5 y.min=0.0 y.max=0.15
doping uniform p.type conc=5e19 x.min=27.5 x.max=28.5 y.min=0.0 y.max=0.15
#....n+ doping
doping uniform n.type conc=5e19 x.min=5.5 x.max=6.5 y.min=0.0 y.max=0.15
doping uniform n.type conc=5e19 x.min=23.5 x.max=24.5 y.min=0.0 y.max=0.15

save outf=diode-01.str
model conmob fldmob srh optr auger bgn
impact selb
method newton trap maxtrap=10
contact name=anode
solve init
log outf=diode-IV.log
solve vanode=-0.0 vstep=-1.0 vfinal=-15.0
solve vstep=-0.2 vfinal=-20.0  name=anode
tonyplot diode-IV.str
tonyplot diode-IV.log
quit

电场分布

电流电压曲线

我想求教为什么电流这么小呢  我想要的是这个光电二极管的雪崩击穿特性