ECE474S09_Lecture30 - cm-3 Junction Depletion region: W pn...

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ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Michigan State University ayresv@msu.edu
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Lecture 30: Chp. 05: Current State-of-Art Transistors Introduction to pn junctions
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Si n p n Si n p n Si n p n OFF I V I V Transistor: a device for binary logic (Chp. 06) ON Saturation regime ON Linear (ohmic) regime
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Si n p n OFF Transistor: a device for binary logic (Chp. 06) p n n Si p n Si
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pn junction: Energy picture: p 0 = 10 13 cm -3 n 0 = 10 17 cm -3
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pn junction: Energy picture: individually: E F E i E V E C E gap = 1.1 eV E F E i E V E C E gap = 1.1 eV 0.407 eV 0.2 eV p 0 = 10 13 cm -3 n 0 = 10 17 cm -3
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pn junction: Energy picture: individually: E F E i E V E C E gap = 1.1 eV E F E i E V E C E gap = 1.1 eV 0.407 eV 0.2 eV p 0 = 10 13 cm -3 n 0 = 10 17 cm -3 Align the Fermi energy levels
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pn junction: Energy picture: individually: E F E i E V E C E gap = 1.1 eV E i E V E C E gap = 1.1 eV 0.407 eV 0.2 eV p 0 = 10 13 cm -3 n 0 = 10 17 cm -3 Align the Fermi energy levels
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pn junction: Energy picture E F E i E V E C E gap = 1.1 eV E i E V E C E gap = 1.1 eV 0.407 eV 0.2 eV p 0 = 10 13 cm -3 n 0 = 10 17 cm -3 “Connect the dots” E F
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pn junction: Energy picture E F E i E V E C E gap = 1.1 eV E i E V E C E gap = 1.1 eV 0.407 eV 0.2 eV p 0 = 10 13 cm -3 n 0 = 10 17
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Unformatted text preview: cm-3 Junction Depletion region: W pn junction: Expanded picture of junction: E F p = 10 13 cm-3 Junction Depletion region: W n = 10 17 cm-3 B B B-B-E F P+ P+ P P P P P P P x p0 x n0 pn junction: Expanded picture of junction: E F p = 10 13 cm-3 Junction Depletion region W n = 10 17 cm-3 B B B B-E F P+ P+ P P P P P P P Unbalanced p0 n0 pn junction: another Built-in E-field E F p = 10 13 cm-3 Junction Depletion region W n = 10 17 cm-3 B B B-B-E F P+ P+ P P P P P P P qV = 0.2 eV + 0.407 eV = 0.607 eV Neutral region p-side Neutral region n-side E i E i E (x) pn junction: new: Energy Barrier E F p = 10 13 cm-3 Junction Depletion region W n = 10 17 cm-3 B B B-B-E F P+ P+ P P P P P P P qV = 0.2 eV + 0.407 eV = 0.607 eV Neutral region p-side Neutral region n-side E i E i E (x)...
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ECE474S09_Lecture30 - cm-3 Junction Depletion region: W pn...

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