Guilin Sun
Ansys Employee

Yes, G is the  generated electron-hole pair inside the total volume. Please check the total absorbed power from FDTD and see how much power is injected into this small semiconductor volume, and you will have an idea. Where it is high or not, it depends on the device, and the mesh that can handle it. In this example the warning message clears shows that the solvers failed after 100 iteration, it means it cannot converge within 100 iteration. You may try more number of iteration but the gradient might be too high. You can try.