--- /dev/null
+function p=DDGOXhole_driftdiffusion(mesh,Dsides,nin,pin,V,up,tn,tp,n0,p0)
+
+%%
+% p=DDGhole_driftdiffusion(mesh,Dsides,nin,pin,V,up,tn,tp,n0,p0)
+% IN:
+% v = electric potential
+% mesh = integration domain
+% nin = initial guess and BCs for electron density
+% pin = hole density (to compute SRH recombination)
+% 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/>.
+
+if (Ucolumns(nin)>Urows(nin))
+ nin=nin';
+end
+
+if (Ucolumns(V)>Urows(V))
+ V=V';
+end
+
+if (Ucolumns(pin)>Urows(pin))
+ pin=pin';
+end
+
+Nnodes = max(size(mesh.p));
+Nelements = max(size(mesh.t));
+
+denom = (tp*(nin+sqrt(n0.*p0))+tn*(pin+sqrt(n0.*p0)));
+u = up;
+U = n0.*p0./denom;
+M = nin./denom;
+guess = pin;
+V = -V;
+
+p = Udriftdiffusion(mesh,Dsides,guess,M,U,V,u);
+
+
+