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Loke et al., 2D to 3D MOS Technology Evolution for Circuit Designers

Loke et al., 2D to 3D MOS Technology Evolution for Circuit Designers

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Benefits of H<strong>al</strong>o and Extension<br />

Resulting structure<br />

• Less short-channel effect<br />

• Sh<strong>al</strong>low junction where<br />

needed most<br />

• Low junction capacitance<br />

poly<br />

gate<br />

h<strong>al</strong>os<br />

h<strong>al</strong>os<br />

Not <strong>to</strong> be confused with LDD in I/O FET<br />

• Same process with spacers but Iightly doped drain (LDD) is<br />

used <strong>for</strong> minimizing peak electric fields that cause hot<br />

carriers & breakdown<br />

• Extensions need <strong>to</strong> be heavily doped <strong>to</strong> minimize series<br />

resistance<br />

Different h<strong>al</strong>o & extension/LDD implants <strong>for</strong> each FET variant<br />

© <strong>Loke</strong> <strong>et</strong> <strong>al</strong>., <strong>2D</strong> <strong>to</strong> <strong>3D</strong> <strong>MOS</strong> <strong>Technology</strong> <strong>Evolution</strong> <strong>for</strong> <strong>Circuit</strong> <strong>Designers</strong><br />

Slide 43

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