Summary
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5.1 Diodes and other semiconductor devices are made by combinations of steps such as oxidation, selective doping (via implant or diffusion), and the deposition of various insulators or metals in concert with etching, using patterns formed by photolithography.
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5.2 When we bring p- and n-type semiconductors into contact to make a p-n junction diode, carriers diffuse across the junction until we get a flat Fermi level in equilibrium. A built-in junction potential barrier is formed between the p and n sides, which reflects the voltage drop across the depletion region. This is a dynamic equilibrium, in which there is a continual diffusion of electrons from the n to the p side (and holes from p to n), but at a reduced rate over the potential ...
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