33.SSD(EE-2080)L33_7april

33.SSD(EE-2080)L33_7april - Problems of classical...

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SSD(EE-2080) Lecture 33 Dr. Shiv Govind Singh sgsingh@iith.ac.in Assistant Professor Electrical Engineering Semester 2, Y-2010/11
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Reference Text Book: 1. Physics of Semiconductor Devices, S. M. Sze , John Wiley & Sons (1981). 2. Solid State Electronics by Ben G. Streetman and Sanjay Banerjee , Prentice Hall International , Inc. 3. Semiconductor Physics and Devices, Donald A. Neamen, Tata Mcgraw-Hill Publishing company Limited. Reference Book: Semiconductor Device Fundamental R. Pirret
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Punch Through Early effect
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Collector Doping
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Kirk Effect …..
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Perhaps High Doping in Emitter Tunneling cause loss of base control …
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Unformatted text preview: Problems of classical transistor : Bird view • Emitter doping: As high as possible without band gap narrowing • Base doping: As as possible without NE low possible, current crowding, Early effect • Collector Lower doping: than base doping without Kirk Effect • Base Width As thin as possible without punch through How to make better Transistor Graded Base transport Polysilicon Emitter Heterojunction Bipolar Transistor Classical Shockley Transistor Poly‐silicon Emitter Poly‐silicon Emitter Gain in Poly‐silicon Transistor Short‐base Quasi‐ballistic Transistor Gain…...
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This note was uploaded on 07/19/2011 for the course EE 211 taught by Professor Sgsingh during the Spring '11 term at IIT Kanpur.

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33.SSD(EE-2080)L33_7april - Problems of classical...

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