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  1. Silicon atoms act as p-type dopants in Arsenic sites and n-type dopants in Gallium sites
  2. Silicon atoms act as n-type dopants in Arsenic sites and p-type dopants in Gallium sites
  3. Silicon atoms act as p-type dopants in Arsenic as well as Gallium sites
  4. Silicon atoms act as n-type dopants in Arsenic as well as Gallium sites
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1 Answers

Option 1 : Silicon atoms act as p-type dopants in Arsenic sites and n-type dopants in Gallium sites

Concept:

If the substituting atom gives one extra electron in the outermost shell then n-type semiconductor is formed. If substituting atom has one electron less in the outermost shell then p-type semiconductor is formed.

Si → 4e- in the outermost shell

Ga → 3e- in the outermost shell

As → 5e- in the outermost shell

Application:

Note:  Here, GaAs is doped with Silicon. So, Silicon is the substituting atom.

For Arsenic sites, Silicon will act as a p-type dopant as it has 1 electron less than Arsenic in its outermost shell.

And for Gallium sites, Silicon will act a n-type dopant as it has 1 electron more than Gallium in its outermost shell.

Si → Ga → 1e- extra → n-type

Si → As → 1e- less → p-type

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