Hello,
With regards to the issue of negative concentration in general, please see:
www.comsol.com/support/knowledgebase/952/
Based upon some of the previous questions about stabilization in this thread, we would also recommend reading:
www.comsol.com/blogs/understanding-stabilization-methods/
Some of the questions here also seem to touch upon solving a form of the drift-diffusion equations in log form. It is reasonable to say that this would be fairly involved to implement, but it is also worth pointing out that the Semiconductor Module (www.comsol.com/semiconductor-module) does already include such a log formulation for electron and hole transport.
Best Regards,
With regards to the issue of negative concentration in general, please see:
www.comsol.com/support/knowledgebase/952/
Based upon some of the previous questions about stabilization in this thread, we would also recommend reading:
www.comsol.com/blogs/understanding-stabilization-methods/
Some of the questions here also seem to touch upon solving a form of the drift-diffusion equations in log form. It is reasonable to say that this would be fairly involved to implement, but it is also worth pointing out that the Semiconductor Module (www.comsol.com/semiconductor-module) does already include such a log formulation for electron and hole transport.
Best Regards,