Photovoltaic Devices and Light Emitting Diodes

This lecture covers the principles and mechanisms of photovoltaic devices, including solar cells and light emitting diodes (LEDs). It begins with an overview of solar cells, detailing their working principles, figures of merit, and considerations regarding photovoltaic materials. The instructor discusses the various generations of solar cells, emphasizing the importance of understanding charge transport and the factors affecting efficiency. The lecture also delves into the working mechanisms of LEDs, highlighting their role in energy-efficient lighting solutions. The discussion includes the challenges faced in optimizing these devices, such as defect density and efficiency droop in LEDs. Additionally, the lecture addresses the significance of material selection in enhancing the performance of both solar cells and LEDs, providing insights into the latest advancements in the field. Overall, this lecture serves as a comprehensive introduction to optoelectronic devices, focusing on their applications and the underlying physics that govern their operation.