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Lecture15(1)

# A calculate the fermi level positions at 300k b draw

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Unformatted text preview: le An abrupt Si p-n junction has Na = 1018 cm-3 on one side and Nd = 5 × 1015 cm-3 on the other. (a)  Calculate the Fermi Level positions at 300K. (b)  Draw and equilibrium band diagram and determine the contact potential. (c)  Compare the results of (b) with Vo calculated as Eq. 5-8. EE 332 Spring 2013 Conclusion Conclusion of Contact Potential Conclusion EE 332 Spring 2013 Movement of electrons and holes when forming the junction Movement of electrons and holes when Junction Solution forming the junction Depletion Region Approximation: Step Depletion in Depletion Step Junction Solution Approximation: Region Charge Density Region in Depletion Region Charge DensityApproximation: Step Junction Solution Depletion Region Charge Density in Depletion Region qN A for x x x x 0 0 qN A for p p qN A for 0 x p x xx 0 qN D for 0 x n qN D for xn 0 x xn D 0 0 qNforx xfor x x and x x x n for p xn p and 0 for x x p and x x n thus, , thus thus, qN A qN A for x p for x p x x 0 0 qN A KK o for x S x0 p So KqNoD dE S qN dE for qN D D for 0 0 x x x n n dE dx KK o...
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