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    P-N Junction

    One of the crucial keys tosolid state electronicsis the nature of the P-N junction. Whenp-typeandn-typematerials are placed in contact with each other, the junction behaves very differently than either type of material alone. Specifically, current will flow readily in one direction (forward biased) but not in the other (reverse biased), creating the basicdiode. This non-reversing behavior arises from the nature of the charge transport process in the two types of materials. The open circles on the left side of the junction above represent holes or deficiencies of electrons in the lattice which can act like positive charge carriers. The solid circles on the right of the junction represent the available…

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