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Diodes. Silicon Crystal structure From column IVa of the periodic table and has 4 electrons to share with adjacent atoms.

Published byTheodora Malone Modified over 9 years ago

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Presentation on theme: "Diodes. Silicon Crystal structure From column IVa of the periodic table and has 4 electrons to share with adjacent atoms."— Presentation transcript:

1 Diodes

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3 Silicon Crystal structure From column IVa of the periodic table and has 4 electrons to share with adjacent atoms

4 N-Doped Silicon Silicon doped with Phosphorous from column Va It has 5 electrons to share; 4 bond with Si and 1 free to move Forms N type material

5 P-Doped Silicon Si doped with Al from Column IIIa Only 3 electrons available. The 4 th Si covalent bond doesn’t occur leaving a “hole”

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8 Shockley Equation I s is the saturation current ~10 -14 V d is the diode voltage n – emission coefficient (varies from 1 - 2 ) k = 1.38 × 10 –23 J/K is Boltzmann’s constant q = 1.60 × 10 –19 C is the electrical charge of an electron. At a temperature of 300 K, we have

9 Get more information www.play- hookey.com/semiconductors/pn_junction.htmlwww.play- hookey.com/semiconductors/pn_junction.html http://www.fairchildsemi.com/pf/1N/1N4001.html

10 Zener Diodes Diodes that are intended to operate in the breakdown region are called Zener diodes.

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12 LOAD-LINE ANALYSIS OF DIODE CIRCUITS

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