Question

A Si sample contains 1016 cm-3 In acceptor atoms and a certain number of shallow donors, the In acceptor level is 0.16 eV above Ev , and EF is 0.26 eV above Ev at 300 K. How many (cm-3) In atoms are un-ionized (i.e., neutral)

Answer 1

Explanation: see attachment below

Answer 2

6.5 × 10¹⁵/ cm³

Step-by-step explanation:

Thinking process:

The relation
`N_(o) = N_(i) * (E_(f)-E_(i) )/(KT)`

With the expression Ef - Ei = 0.36 × 1.6 × 10⁻¹⁹

and ni = 1.5 × 10¹⁰

Temperature, T = 300 K

K = 1.38 × 10⁻²³

This generates N₀ = 1.654 × 10¹⁶ per cube

Now, there are 10¹⁶ per cubic centimeter

Hence,
`N_(d) = 1.65*10^(16) - 10^(16) \\ = 6.5 * 10^(15) per cm cube`