Hi Juan,
I got ids=0 with the mos_2d.py file under folder testing.
below is the code i modified a little bit to plot it. please help.
Copyright 2013 DEVSIM LLC
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
import mos_2d_create
from mos_2d_physics import *
from devsim.python_packages.ramp import *
import devsim
device=devsim.get_device_list()[0]
oxide_regions = (“oxide”,)
silicon_regions = (“gate”, “bulk”)
all_regions = (“gate”, “bulk”, “oxide”)
for i in all_regions:
createSolution(device, i, “Potential”)
for i in silicon_regions:
setSiliconParameters(device, i)
createSiliconPotentialOnly(device, i)
for i in oxide_regions:
setOxideParameters(device, i)
createOxidePotentialOnly(device, “oxide”)
createSiliconPotentialOnlyContact(device, “gate”, “gate”)
createSiliconPotentialOnlyContact(device, “bulk”, “drain”)
createSiliconPotentialOnlyContact(device, “bulk”, “source”)
createSiliconPotentialOnlyContact(device, “bulk”, “body”)
createSiliconOxideInterface(device, “bulk_oxide”)
createSiliconOxideInterface(device, “gate_oxide”)
devsim.solve(type=“dc”, absolute_error=1.0e-13, relative_error=1e-12, maximum_iterations=30)
devsim.solve(type=“dc”, absolute_error=1.0e-13, relative_error=1e-12, maximum_iterations=30)
createSolution(device, “gate”, “Electrons”)
createSolution(device, “gate”, “Holes”)
devsim.set_node_values(device=device, region=“gate”, name=“Electrons”, init_from=“IntrinsicElectrons”)
devsim.set_node_values(device=device, region=“gate”, name=“Holes”, init_from=“IntrinsicHoles”)
createSiliconDriftDiffusion(device, “gate”)
createSiliconDriftDiffusionAtContact(device, “gate”, “gate”)
createSolution(device, “bulk”, “Electrons”)
createSolution(device, “bulk”, “Holes”)
devsim.set_node_values(device=device, region=“bulk”, name=“Electrons”, init_from=“IntrinsicElectrons”)
devsim.set_node_values(device=device, region=“bulk”, name=“Holes”, init_from=“IntrinsicHoles”)
createSiliconDriftDiffusion(device, “bulk”)
createSiliconDriftDiffusionAtContact(device, “bulk”, “drain”)
createSiliconDriftDiffusionAtContact(device, “bulk”, “source”)
createSiliconDriftDiffusionAtContact(device, “bulk”, “body”)
devsim.solve(type=“dc”, absolute_error=1.0e30, relative_error=1e-5, maximum_iterations=30)
devsim.element_from_edge_model(edge_model=“ElectricField”, device=device, region=“bulk”)
devsim.write_devices(file=“mos_2d_dd.msh”, type=“devsim”)
devsim.write_devices( file=“mos_2d_dd”, type=“vtk”)
devsim.set_parameter(device=device, name=GetContactBiasName(‘drain’), value=0.1)
devsim.solve(type=“dc”, absolute_error=1.0e30, relative_error=1e-5, maximum_iterations=30)
printCurrents(device, “drain”, 0)
#write_devices(file=“gmsh_mos2d_dd_kla.dat”, type=“tecplot”)
#write_devices(file=“gmsh_mos2d_dd_kla”, type=“vtk”)
vgs=[]
cgg=[]
ids=[]
v=0.0
while v < 10.1:
devsim.set_parameter(device=device, name=GetContactBiasName('gate'), value=v)
devsim.solve(type="dc", absolute_error=1.0e30, relative_error=1e-5, maximum_iterations=30)
#solve(type="dc", absolute_error=1e30, relative_error=1e-10, maximum_iterations=100)
#PrintCurrents(device, "drain")
contact_bias_name = GetContactBiasName('drain')
electron_current= get_contact_current(device=device, contact='drain', equation="ElectronContinuityEquation")
hole_current= get_contact_current(device=device, contact='drain', equation="HoleContinuityEquation")
total_current= electron_current + hole_current
#solve(type="ac", frequency=1.0)
#cap=get_circuit_node_value(node="V1.I", solution="ssac_imag")/ (-2*math.pi)
#print("capacitance {0} {1}".format(v, cap))
vgs.append(v)
#cgg.append(cap)
ids.append(total_current)
v += 1
import matplotlib
import matplotlib.pyplot
matplotlib.pyplot.figure(2)
matplotlib.pyplot.plot(vgs, ids, linestyle=‘-’, marker=‘o’)
#matplotlib.pyplot.yscale(‘log’)
matplotlib.pyplot.xlabel(‘vgs (v)’)
matplotlib.pyplot.ylabel(‘ids (A)’)
matplotlib.pyplot.show()
