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​For fabricating an integrated circuit (IC), which oxidation method should be chosen to&nb
Question

For fabricating an integrated circuit (IC), which oxidation method should be chosen to achieve a faster oxidation rate for creating thick silicon dioxide (SiO2) layers exceeding 1 μm, while accepting a higher density of interface states?\text{For fabricating an integrated circuit (IC), which oxidation method should be chosen to achieve a faster oxidation rate for creating thick silicon dioxide (SiO}_2\text{) layers exceeding } 1\,\mu\text{m, while accepting a higher density of interface states?}​​

A.

Wet oxidation

B.

Dry oxidation

C.

Slow oxidation

D.

Slow and then wet oxidation

Correct option is A

When fabricating ICs, the method used to grow silicon dioxide depends on the required thickness and quality:Wet oxidation Much faster oxidation rate than dry oxidation Suitable for thick SiO2 layers (> 1 μm) Produces lower-quality oxide with higher interface state density Commonly used where oxide quality is not critical (field oxides)Dry oxidation Produces high-quality SiO2 But growth rate is slow, not suitable for thick layersThus, to achieve fast growth of thick oxide while tolerating poorer interface quality, wet oxidation is preferred.\text{When fabricating ICs, the method used to grow silicon dioxide depends on the required thickness and quality:} \\[6pt]\textbf{Wet oxidation} \\[4pt]\bullet \ \text{Much faster oxidation rate than dry oxidation} \\[2pt]\bullet \ \text{Suitable for thick SiO}_2 \text{ layers (> 1 } \mu\text{m)} \\[2pt]\bullet \ \text{Produces lower-quality oxide with higher interface state density} \\[2pt]\bullet \ \text{Commonly used where oxide quality is not critical (field oxides)} \\[8pt]\textbf{Dry oxidation} \\[4pt]\bullet \ \text{Produces high-quality SiO}_2 \\[2pt]\bullet \ \text{But growth rate is slow, not suitable for thick layers} \\[8pt]\text{Thus, to achieve \textbf{fast growth of thick oxide} while tolerating poorer interface quality, \textbf{wet oxidation} is preferred.}​​

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