Semiconductors have been omnipresent in the form of computers for decades and have grown far beyond in usage. Designing, analyzing and optimizing semiconductor devices is possible for various scenarios using our COMSOL Multiphysics Semiconductor Module. The drift-diffusing equation approach enables the simulation of junctions, transistors, and diodes in various forms and alterations. The desire to model quantum-confined systems such as quantum wells, wires, and dots is enabled by the Schrödinger equation approach. Our Multiphysics coupling capabilities enable a seamless optical transition for devices such as LEDs, photodiodes and solar cells. A thermal analysis can be added at ease.