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For the above image, why do the holes move towards the negative terminal of the battery when the diode is in reverse bias? And why dont the free electrons just move through the wire to the negative terminal and into the P region?

  • \$\begingroup\$ Ask yourself this: What would be pushing the electrons to move through the wire into the P region? The negative voltage from the supply repels the free electrons since they also have a negative charge, it's not going to pull them through the wire.The same goes for the holes, but in reverse \$\endgroup\$ – DerStrom8 Jan 5 at 4:02
  • \$\begingroup\$ This isnt a BJT, so I'm confused about your title. Anyway, holes move toward negative power supplies normally. Why do you expect they wouldnt? In reverse bias electrons do come from the wire at your negative terminal and go into the p region. I dont understand your question. I think part of the confusion comes from this "battery" you are talking about and how its hooked up. Whether your diode is in forward or reverse bias is a function of how its attached to your power supply, or battery. I think it would be easier to consider one side of the diode at ground and the other at a variable voltage \$\endgroup\$ – Matt Jan 5 at 4:10
  • \$\begingroup\$ If the negative terminal repels the free electrons, why dont the electrons simply to move back through the wire to the battery positive terminal? \$\endgroup\$ – AskJheeze Jan 5 at 4:48
  • \$\begingroup\$ @AskJheeze Electrons do move through a wire to a battery positive terminal... I suggest drawing a schematic showing more specifically what you are picturing in your head with the currents and voltages you think exist. There is no battery in your figure, so any answer has to guess about how you have things hooked up. \$\endgroup\$ – Matt Jan 5 at 14:19

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