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How is the p1 start with say n type si wafer for more

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Unformatted text preview: ith, say, a n-type Si wafer - implantation Then dope by p-type ion (BN)junction fabricated? How is the P1) Start with, say, n-type Si wafer For more details please take EE 432 2) Then dope by p-type ion (B-) implantation: EE 332 Spring 2013 Energy Band Diagram w/o w/o Junction Energy Band Diagram w/oJunction Energy Band Diagram Junction •  In regions far away from the “junction” the band diagram EE 332 Spring 2013 hat happens in the junction? What happens in the Junction? What happens in the junction? •  Space charge or depletion region EE 332 Spring 2013 Depletion Region Region Depletion Depletion Region •  Space charge or depletion region EE 332 Spring 2013 Build-in Potential Build-in Potential Barrier EE 332 Spring 2013 Why “Depletion Region”? Why “Depletion Region”? Why “Depletion Region”? 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 d...
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