Pdf 4373 ne e 38 2013 02 15 104732 4473 chapter

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Unformatted text preview: electrons sit in a donor state located close to the top of the band gap 2013-02-15 10:47:32 43/73 Chapter 18.pdf (43/73) • • • – – – • n|e| e 38 2013-02-15 10:47:32 44/73 Chapter 18.pdf (44/73) 2013-02-15 10:47:32 45/73 Chapter 18.pdf (45/73) 2013-02-15 10:47:32 46/73 Chapter 18.pdf (46/73) 2013-02-15 10:47:32 47/73 Chapter 18.pdf (47/73) 2013-02-15 10:47:32 48/73 Chapter 18.pdf (48/73) • • – – • • • p|e| 2013-02-15 10:47:32 h 49/73 Chapter 18.pdf (49/73) • • • • 40 2013-02-15 10:47:33 50/73 Chapter 18.pdf (50/73) • Increase in thermal energy allows electrons move into the conduction band intrinsic carrier concentration increases n 2013-02-15 10:47:33 51/73 no exp Eg 2 kT Chapter 18.pdf (51/73) • n n p 2013-02-15 10:47:34 52/73 no exp nDo exp p Ao exp Eg 2kT ED kT EA kT Chapter 18.pdf (52/73) n ( E g / 2) no exp kT ln(n) ln(no ) Eg 2kT log(n) log(no ) y b Eg 1 2.3(2k ) T m x 43 2013-02-15 10:47:34 53/73 Chapter 18.pdf (53/73) • • • • – – • • 44 2013-02-15 10:47:34 54/73 Chapter 18.pdf (54/73) 45 2013-02-15 10:47:34 55/73 Chapter 18.pdf (55/73) Extra Material Solid state devices 2013-02-15 10:47:35 56/73 Chapter 18.pdf (56/73) • Bias – Forward • • Reverse – – • 47 2013-02-15 10:47:35 57/73 Chapter 18.pdf (57/73) • • • – – • – – > 100 V 48 2013-02-15 10:47:35 58/73 Chapter 18.pdf (58/73) P + + P ++++ ++++ ++++ ++++ ++++ + + + n + + + + + n + + + + + + + + + + - - P - - ++++ -++++ ---++++ ---++++ ---++++ - - - P P ++++ ++++ ++++ ++++ ++++ + + + + + + + + + + n + + + + + ------ P ------ + + + + + + + + + + + + + + + - + 49 2013-02-15 10:47:35 59/73 Chapter 18.pdf (59/73) Extra 50 2013-02-15 10:47:35 60/73 Chapter 18.pdf (60/73) Extra 51 2013-02-15 10:47:35 61/73 Chapter 18.pdf (61/73) 52 2013-02-15 10:47:36 62/73 Chapter 18.pdf (62/73) • • • • – – 53 2013-02-15 10:47:36 63/73 Chapter 18.pdf (63/73) • • • • • • 54 2013-02-15 10:47:36 64/73 Chapter 18.pdf (64/73) 2013-02-15 10:47:36 65/73...
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