3.1 - Chapter 3 The PN Junction 3.1 3.2 3.3 3.4 PN-Junction...

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ECE3080, Chapter 3.1 1 May 30, 2005 ECE 3080: Chapter 3.1 – PN Junction O. Brand, 1 of 20 Chapter 3 – The PN Junction 3.1 PN-Junction Electrostatics 3.2 I-V Characteristic 3.3 Non-Idealities 3.4 Dynamic Behavior Literature: Pierret, Chapter 5-8, page 195-343 Sze, Chapter 4, page 84-127 May 30, 2005 ECE 3080: Chapter 3.1 – PN Junction O. Brand, 2 of 20 The PN Junction I = I s e qV A /kT ! 1 " # $ % I-V Characteristic P N Circuit Symbol + Forward Bias Reverse Bias +
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ECE3080, Chapter 3.1 2 May 30, 2005 ECE 3080: Chapter 3.1 – PN Junction O. Brand, 3 of 20 3.1 PN Junction: Electrostatics 3.1.1 PN Junction Basics – Junction Approximations – Band Structure – Built-In Potential 3.1.2 Step PN Junction – Equilibrium V A = 0 – External Bias V A 0 3.1.3 Linearly Graded PN Junction – Equilibrium V A = 0 – External Bias V A 0 Pierret, Chapter 5, page 195-226 May 30, 2005 ECE 3080: Chapter 3.1 – PN Junction O. Brand, 4 of 20 3.1.1 PN Junction Basics Example: Diffusion of acceptor atoms (e.g. boron) in n-substrate Metallurgical junction at N A = N D or N D – N A =0 Net Doping N D – N A Pierret, Fig. 5.1
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3 May 30, 2005 ECE 3080: Chapter 3.1 – PN Junction O. Brand, 5 of 20 Doping Profile Approximations for PN Junctions Approximations for doping profile in pn junctions: Step Junction : approximation for ion implantation or shallow diffusion into lightly doped wafer Linearly Graded Junction : approximation for deep diffusion in moderately to heavy doped wafer Step Junction Linearly Graded Junction Pierret, Fig. 5.2 May 30, 2005 ECE 3080: Chapter 3.1 – PN Junction O. Brand, 6 of 20 PN Junction Band Diagram Equilibrium requires the Fermi level to be constant across the device Regions far away from the metallurgical junction will be unaffected Electrons diffuse from n- to p- side, holes from p- to n-side, leaving behind unbalanced dopant site charges This space charge
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This note was uploaded on 08/28/2010 for the course ECE 3080 taught by Professor Staff during the Spring '08 term at Georgia Tech.

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3.1 - Chapter 3 The PN Junction 3.1 3.2 3.3 3.4 PN-Junction...

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