Diode Schottky and PN Heterojunctions: Band Structure Analysis

This lecture focuses on the construction of band diagrams for various semiconductor structures, including Schottky diodes and PN heterojunctions. The instructor begins by explaining the concept of band structures and the energy levels involved in semiconductors, such as the work function and the Fermi level. The lecture progresses through exercises that require students to draw band diagrams at equilibrium, emphasizing the importance of understanding charge distribution and electric fields in these structures. The instructor illustrates how to determine the positions of energy levels and the implications of doping on the band structure. Additionally, the lecture covers the characteristics of PIN photodiodes and semiconductor lasers, highlighting their operational principles and applications in quantum science. The instructor engages students in problem-solving exercises, reinforcing the theoretical concepts with practical examples. Overall, the lecture provides a comprehensive overview of semiconductor physics, focusing on the critical aspects of band structure and its relevance to modern electronic devices.