Learning Forum

[Stefano R]

Hello,

I want to find the capacitance of a small micrometer-scale design I imported from a .gds file. I have a top gate and a bottom gate as gold, there are other gates but I removed them for now to simplify the model. There is a dielectric substrate between the gates.

The mesh does not converge even for the most coarse initial settings. The Energy Error is sufficiently low to converge but Delta Energy is never low enough. I have it at 1% Delta Energy. I let the number of passes reach 30 but at that point, the # of tetrahedrons is so large that my computer crashes. What are some things I can do to get the mesh to converge?  I tried Curvilinear Meshing to all geometry but that did not work.

I repeated the same model in Q3Design and cannot get mesh convergence there either.

[HDLI]

Hello Srocca,

      Could you show what are the excitation? What does geometry look like? Which Maxwell solver are you using? Thanks.

HDLI

 

 

[Stefano R]

This is the model in Maxwell 3D Electrostatics of quantum dot with metal contacts. I apply a 1V excitation to the Red Top Gate as an excitation. I am getting convergence now that I applied Surface Approximation with Coarse Resolution to the Mesh Settings.  Is this a correct approach?

 

Thanks.

[HDLI]

Hello Srocca,

      Thanks. Do you have another voltage source like 0V or -1V? There is insulator or vaccum between two sources for the capacitor simulation.

HDLI