Numerical Modelling of PIN Diodes

The coupled non-linear partial differential equations describingthe behaviour of PIN diodes are solved using a conservativefinite-difference scheme. For such problems the conservationof certain quantities is particularly important and the consistencyof the numerical scheme is demonstrated. Problems are consideredin cylindrical polar co-ordinates, and particular attentionis paid to the correct discretization of the boundary conditions.The modelling of large thin diodes is also considered. Numericalresults illustrating various features are presented.