Hi @alireza. The Device region usually provides the following results, bandstructure, charge, doping, electrostatics, mobility, and recombination. These are also included in the list under the ‘Results’ tab in the edit properties window of the Device region. However, the solver also provides results for all the electrical contacts which is not part of this list as the name and number of electrical contacts vary from one simulation to the other. In the project file of this particular example, there are three electrical contacts, anode, cathode, and body (you can see them in the ‘Electrical contacts’ window at the bottom). These electrical contacts allow you to apply bias voltages and sweep them to get I-V characteristics. If you go into the edit properties window for the ‘anode’ contact, you will see that it is set to sweep from 0 V to -3 V. If you run the simulation without modifying anything (i.e. with the optical generation objects all disabled), the Device region will have results (datasets) named after the contacts (i.e. anode, cathode, and body) after the simulation is run. If you visualize (for example) the dataset ‘anode’, it will show you the current at that contact as a function of the applied voltage.