PN-Junction:
When two materials, one being n type as in negatively charged (when there are more electron than proton) and one being p type as in positively charged (more protons than electrons) are placed next to each other. When a voltage is given, one way current will flow through it, because they have a nonconductive layer where the n type and p type silicon attracted and eliminated each other. By manipulating this layer, they allow the junction to be used as diodes where electricity flow one way only.
PN-Junction is made when you place a n type (negatively charged) semi conductor (intermediate betwen insolator and conductor. It can become a great conductor when circumstances for certain semi conductors are met) next to a p type (positively charged) semi conductor in close contact.
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