This course aims to provide a general understanding of semiconductor devices. This course explores the principles and the operation mechanism of semiconductor, such as charge transfer, p-n junction, junction capacitors, and Metal-Oxide-Semiconductor Field Effect Transistors(MOSFETs). The lecture notes can be downloaded with registration, that helps students watch the videos. It is recommeded to print them in two pages in one A4 sheet and take notes during lectures for better understanding. Also, there are quiz problems to check your understanding of the lectures each week. To receive course certificate, you must score at least 60% of each week's quiz withing two chances. Lecture notes, quiz and certificate are offered to registered students only. week 1 Introduction to Semiconductor Devices week 2 Crystal properties, Atoms, Electons and Schrodinger Equation 　 week 3 Carriers in Semiconductors week 4 Excess Carriers and Drift Carriers in Semiconductors week 5 p-n Junction under Equilibrium week 6 Currnet Flow at p-n Junction week 7 Junction Capacitance, p-n Junction Applications, Breakdown