I am trying to understand my current density simulation results from DEVICE CHARGE. The structure is a simple reverse biased PN junction. Below shows the result: (right side is P, left side is N)
From the perspective of current continuity, the integration of current density over current flow cross section should be constant. Even the current flow direction is not straightforward in my case, I still have trouble understanding why it shows such an abrupt change of current density - basically it seems there is no current flowing in neutral P section and N section.
I also notice that the position of Jn and Jp are slightly different. So I am guessing that Lumerical only solves certain types of current (diffusion for example?) at certain position (quasi-equilibrium boundary of pn junction for example?). Or am I getting something completely wrong?