TernariesΒΆ
Source:
#
# Copyright (c) 2013-2014, Scott J Maddox
# Copyright (c) 2025, Duarte Silva
#
# This file is part of openbandparams.
#
# openbandparams is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# openbandparams is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with openbandparams. If not, see <http://www.gnu.org/licenses/>.
#
#############################################################################
# Make sure we import the local openbandparams version
import os
import sys
sys.path.insert(0,
os.path.abspath(os.path.join(os.path.dirname(__file__), '../..')))
from openbandparams import *
print('All three of these are identical:')
print('>>> AlGaAs(x=0.3).Eg()\n', AlGaAs(x=0.3).Eg())
print('>>> AlGaAs(Al=0.3).Eg()\n', AlGaAs(Al=0.3).Eg())
print('>>> AlGaAs(Ga=0.7).Eg()\n', AlGaAs(Ga=0.7).Eg())
print('')
print('These two are identical:')
print('>>> AlGaAs(x=0.3).Eg_Gamma()\n', AlGaAs(x=0.3).Eg_Gamma())
print('')
print('Alternate forms:')
print('>>> AlGaAs(x=0.3).Eg()\n', AlGaAs(x=0.3).Eg())
print('>>> AlGaAs(x=0.3).Eg(T=300)\n', AlGaAs(x=0.3).Eg(T=300))
print('')
print('This is the preferred usage (more efficient),'
'if you want multiple parameters from one alloy composition:')
print('>>> myAlGaAs = AlGaAs(x=0.3)\n')
myAlGaAs = AlGaAs(x=0.3)
print('>>> myAlGaAs.Eg()\n', myAlGaAs.Eg())
print('>>> myAlGaAs.Eg(T=300)\n', myAlGaAs.Eg(T=300))
print('')
print('Lattice matching to a substrate (at the growth temperature):')
print('>>> a_InP = InP.a(T=800)\n')
a_InP = InP.a(T=800)
print('>>> GaInAs_on_InP = GaInAs(a=a_InP, T=800)\n')
GaInAs_on_InP = GaInAs(a=a_InP, T=800)
print('>>> InP.a(T=800)\n', InP.a(T=800))
print('>>> GaInAs_on_InP.a()\n', GaInAs_on_InP.a(T=800))
print('>>> GaInAs_on_InP.element_fraction("Ga")\n', \
GaInAs_on_InP.element_fraction("Ga"))
print('>>> GaInAs_on_InP.Eg()\n', GaInAs_on_InP.Eg())
print('')
print('Other examples:')
print('>>> AlGaAs.meff_hh_100(Al=0.3)\n', AlGaAs(Al=0.3).meff_hh_100())
print('>>> AlGaAs.meff_hh_110(Al=0.3)\n', AlGaAs(Al=0.3).meff_hh_110())
print('>>> AlGaAs.meff_hh_111(Al=0.3)\n', AlGaAs(Al=0.3).meff_hh_111())
print('>>> AlGaAs.meff_lh_100(Al=0.3)\n', AlGaAs(Al=0.3).meff_lh_100())
print('>>> AlGaAs.meff_lh_110(Al=0.3)\n', AlGaAs(Al=0.3).meff_lh_110())
print('>>> AlGaAs.meff_lh_111(Al=0.3)\n', AlGaAs(Al=0.3).meff_lh_111())
print('')
Result:
All three of these are identical:
>>> AlGaAs(x=0.3).Eg()
1.840788343373494
>>> AlGaAs(Al=0.3).Eg()
1.840788343373494
>>> AlGaAs(Ga=0.7).Eg()
1.8407883433734942
These two are identical:
>>> AlGaAs(x=0.3).Eg_Gamma()
1.840788343373494
Alternate forms:
>>> AlGaAs(x=0.3).Eg()
1.840788343373494
>>> AlGaAs(x=0.3).Eg(T=300)
1.840788343373494
This is the preferred usage (more efficient),if you want multiple parameters from one alloy composition:
>>> myAlGaAs = AlGaAs(x=0.3)
>>> myAlGaAs.Eg()
1.840788343373494
>>> myAlGaAs.Eg(T=300)
1.840788343373494
Lattice matching to a substrate (at the growth temperature):
>>> a_InP = InP.a(T=800)
>>> GaInAs_on_InP = GaInAs(a=a_InP, T=800)
>>> InP.a(T=800)
5.88365
>>> GaInAs_on_InP.a()
5.883650000000193
>>> GaInAs_on_InP.element_fraction("Ga")
0.4716414173026351
>>> GaInAs_on_InP.Eg()
0.7389651416802727
Other examples:
>>> AlGaAs.meff_hh_100(Al=0.3)
0.3748427672955974
>>> AlGaAs.meff_hh_110(Al=0.3)
0.5690595813020004
>>> AlGaAs.meff_hh_111(Al=0.3)
0.6878595104656207
>>> AlGaAs.meff_lh_100(Al=0.3)
0.12159329140461217
>>> AlGaAs.meff_lh_110(Al=0.3)
0.10947341400391464
>>> AlGaAs.meff_lh_111(Al=0.3)
0.10595310296449476