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In a homojunction the barrier potential depends on the difference in Fermi levels been the n and p sides. If different materials are used (heterojunction) then there is an additional potential from intrinsic difference in electron affinity.


Consider a circuit with a capacitor, a voltage source, and a switch. Suppose the voltage source is DC and we flip the switch. If the capacitor is initially uncharged, then at the instant you close the switch current will flow as if the capacitor was not there. Instead of an electron crossing the capacitor, an electron will arrive at the negative capacitor ...

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