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MIT6_012s09_lec15

# MIT6_012s09_lec15 - MIT OpenCourseWare http/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and Circuits Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Lecture 15 The pn Junction Diode (II) Outline I-V characteristics Forward Bias Reverse Bias Reading Assignment: Howe and Sodini; Chapter 6, Sections 6.4 - 6.5 6.012 Spring 2009 Lecture 15 1
F n p n F p 1. I-V Characteristics (contd.) Diode Current equation: I = I o e V V th 1 Physics of forward bias: Potential drop across SCR reduced by V minority carrier injection in QNRs Minority carrier diffusion through QNRs Minority carrier recombination at contacts to the QNRs (and surfaces) Large supply of carriers injected into the QNRs V I e [ V th ] 6.012 Spring 2009 Lecture 15 2

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F n p n F p Physics of reverse bias: Potential drop across SCR increased by V minority carrier extraction from QNRs Minority carrier diffusion through QNRs Minority carrier generation at surfaces & contacts of QNRs Very small supply of carriers available for extraction I saturates to small value 6.012 Spring 2009 Lecture 15 3
Development of analytical current model: 1. Calculate the concentration of minority carriers at edges of SCR; 2. Find the spatial distribution of the minority carrier concentrations in each QNR; 3. Calculate minority carrier diffusion current at SCR edge. 4. Sum minority carrier electron and hole diffusion currents at SCR edge.

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MIT6_012s09_lec15 - MIT OpenCourseWare http/ocw.mit.edu...

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