Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / secs2d-0.0.8 / DDGOXT / DDGOXThole_driftdiffusion.m

diff --git a/octave_packages/secs2d-0.0.8/DDGOXT/DDGOXThole_driftdiffusion.m b/octave_packages/secs2d-0.0.8/DDGOXT/DDGOXThole_driftdiffusion.m
new file mode 100644 (file)
index 0000000..99f2af1
--- /dev/null
+++ b/octave_packages/secs2d-0.0.8/DDGOXT/DDGOXThole_driftdiffusion.m
@@ -0,0 +1,59 @@
+function p=DDGOXThole_driftdiffusion(mesh,Dsides,nin,pin,V,up,tn,tp,n0,p0,weight)
+
+%%
+%   p=DDGhole_driftdiffusion(mesh,Dsides,nin,pin,V,un,tn,tp,n0,p0,weight)
+%
+%   IN:
+%     V      = electric potential
+%     mesh   = integration domain
+%     nin    = electron density in the past
+%     pin    = hole density in the past  + initial guess
+%     n0,p0  = equilibrium densities
+%     tn,tp  = carrier lifetimes
+%     weight = BDF weights
+%     up     = mobility
+%
+%   OUT:
+%     p      = updated hole density
+%
+%%
+
+% This file is part of 
+%
+%            SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
+%         -------------------------------------------------------------------
+%            Copyright (C) 2004-2006  Carlo de Falco
+%
+%
+%
+%  SECS2D is free software; you can redistribute it and/or modify
+%  it under the terms of the GNU General Public License as published by
+%  the Free Software Foundation; either version 2 of the License, or
+%  (at your option) any later version.
+%
+%  SECS2D 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 General Public License for more details.
+%
+%  You should have received a copy of the GNU General Public License
+%  along with SECS2D; If not, see <http://www.gnu.org/licenses/>.
+
+
+BDForder = length(weight)-1;
+
+denom = (tp*(nin(:,end)+sqrt(n0.*p0))+tn*(pin(:,end)+sqrt(n0.*p0)));
+M     = weight(1) + nin(:,end)./denom;
+
+u     = up;
+
+U     = p0.*n0./denom;
+
+for ii=1:BDForder
+  U  += -pin(:,end-ii)*weight(ii+1);
+end
+
+guess = pin(:,end);
+p     = Udriftdiffusion(mesh,Dsides,guess,M,U,-V,u);
+
+