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MOS Transistors Yannis Tsividis CMOS Processes These slides are based on Y. Tsividis and C. McAndrew, “Operation and Modeling of the MOS Transistor”, Copyright © Oxford University Press, 2011. They are meant to be part of a lecture, and may be incomplete or may not even make sense without the accompanying narration.

Lecture Slides 1.3 CMOS Processes

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Page 1: Lecture Slides 1.3 CMOS Processes

MOS Transistors Yannis Tsividis

CMOS Processes

These slides are based on Y. Tsividis and C. McAndrew, “Operation and Modeling of the MOS Transistor”, Copyright © Oxford University Press, 2011. They are meant to be part of a lecture, and may be incomplete or may not even make sense without the accompanying narration.

Page 2: Lecture Slides 1.3 CMOS Processes

Based on Tsividis/McAndrew; Copyright © Oxford University Press, 2011 2

STI processes dominant today

CMOS (Complementary MOS) Fabrication processes

Triple-well STI

𝑛+ 𝑛+

poly poly 𝑝+ 𝑝+ STI oxide

𝑛+ 𝑛+

poly poly Oxide

STI (Shallow Trench Isolation) LOCOS (Local Oxidation of Silicon)

𝑛+ 𝑛+

poly poly

Oxide

𝑛+ 𝑛+ 𝑝+ 𝑝+

Oxide poly Oxide poly

𝑝 𝑛

SOI (Silicon on Insulator)

Page 3: Lecture Slides 1.3 CMOS Processes

Based on Tsividis/McAndrew; Copyright © Oxford University Press, 2011 3

Top view:

Cross section:

Realistic relative dimensions

Page 4: Lecture Slides 1.3 CMOS Processes

Based on Tsividis/McAndrew; Copyright © Oxford University Press, 2011 4

SEM images – Intel 45 nm process

nMOS pMOS

Copyright © 2008 by IEEE; courtesy of Intel Corporation (Auth et al., Proc. 2008 Symp. VLSI Technology, pp. 128-129)