# zI = radius-Delta,
# Delta = \int rho(r) r^2 dr / \int rho(r) r dr
# Cc = fetmodel.Cc_radial(epsS, zI, W1-zI)
# See eq. in
# IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 55, NO. 1, JANUARY 2008 411
# Modeling the Centroid and the Inversion Charge in
# Cylindrical Surrounding Gate MOSFETs,
# Including Quantum Effects
# J. B. Roldán, Andrés Godoy, Francisco Gámiz, Senior Member, IEEE, and M. Balaguer
nmax=5
mmax=5
print('Cox=', Cox,', Cc=', Cc)
p=fetmodel.parameters_ballistic(alpha=alpha,
Ceff=Cox*Cc/(Cox+Cc),
ems=ems,
W1=W1,
W2=W2,
nmax=nmax,
mmax=mmax)
p.output()
Epnm=np.zeros(nmax*mmax)
gamma_nm=np.zeros(nmax*mmax)
alpha_nm=np.zeros(nmax*mmax)
ems_nm=np.zeros(nmax*mmax)
Enm=np.zeros(nmax*mmax)
print('Energy Levels: n, m, parabollic, nonparabollic')
i=0
for n in np.arange(1, p.nmax+1):
for m in np.arange(1,p.mmax+1):
Epnm[i]=fetmodel.Ep_nm_radial1d(p.ems, p.W1/2, int(n), int(m))
epsS = 8.9
tOX = 20e-9
temperature = 300
ems = 0.067
# W1 = 10e-9
# W2 = 8e-9
# alpha = fetmodel.alpha_NP(Eg, ems)
Cox = epsOX*8.85e-12/tOX
Cc = math.sqrt(1.6e-19*1e21/(2*epsS*8.86e-12*1))
# Ceff=Cox*Cc/(Cox+Cc);
Ceff=Cox
# alpha_D = 0
# alpha_G = 1
print(Cox,Cc)
p=fetmodel.parameters_ballistic(Ceff=Ceff,
ems=ems,
)
p.output()
print("Test of ballistic2d: parabolic band")
Vgs = np.arange(-0.1, 1, 0.01)
Ids1 = np.empty_like(Vgs)
Ids2 = np.empty_like(Vgs)
Vds = 0.5
for i, Vgs0 in enumerate(Vgs):
Ids1[i] = fetmodel.Ids_ballistic2d(Vds, Vgs0, p, 0)*1e-3
Ids2[i] = Ids_ballistic2d(Vds, Vgs0, p, 0)*1e-3
fig, ax = plt.subplots()
ax.plot(Vgs, Ids1, label='Ids1')