ECE Purdue Semiconductor Fundamentals L4.2b: Carrier Transport - Diffusion Current скачать в хорошем качестве

ECE Purdue Semiconductor Fundamentals L4.2b: Carrier Transport - Diffusion Current

Table of Contents available below. This video is part of the course "Semiconductor Fundamentals" taught by Mark Lundstrom at Purdue University. The course can be found on nanoHUB.org at https://nanohub.org/courses/sfun or on edX at https://www.edx.org/course/semiconduc... . This course provides the essential foundations required to understand the operation of semiconductor devices such as transistors, diodes, solar cells, light-emitting devices, and more. The material will primarily appeal to electrical engineering students whose interests are in applications of semiconductor devices in circuits and systems. The treatment is physical and intuitive, and not heavily mathematical. Technology users will gain an understanding of the semiconductor physics that is the basis for devices. Semiconductor technology developers may find it a useful starting point for diving deeper into condensed matter physics, statistical mechanics, thermodynamics, and materials science. The course presents an electrical engineering perspective on semiconductors, but those in other fields may find it a useful introduction to the approach that has guided the development of semiconductor technology for the past 50+ years. Table of Contents: 00:00 Lecture 4.2b: Diffusion Current 00:21 Review: drift current 00:40 Topics 01:06 Fick's Law of diffusion: Holes 02:16 Fick's Law of diffusion: Electrons 02:49 Hole diffusion current 03:24 Electron diffusion current 04:35 Physics of diffusion currents 05:38 Diffusion current and diffusion constant 07:55 Another way of looking at diffusion 08:19 After one scattering time 08:44 After two scattering times 09:04 After three scattering times 09:19 After four scattering times 09:24 General result 10:55 Diffusion currents and diffusion coefficients 11:20 Topics 11:35 Relation to the general current equation 12:23 Gradients in the QFL 13:37 Einstein relation 14:04 What causes current to flow? 14:27 Summary