(a) If 5 × 10¹⁷ phosphorus atoms per cm³ are add to silicon as a substitutional impurity, determine the percentage of silicon atoms per unit volume that are displaced in the single crystal lattice.
(b) Repeat part (a) for 2 × 10¹⁵ boron atoms per cm³ added to silicon.

(a) In the single crystal lattice,0.001 % of silicon atoms per unit volume that displaced.

(b)In the single crystal lattice, of silicon atoms per unit volume that displaced.

Explanation:

Unit cell:

Total number of atoms per unit cell of silica is  =8 .

Dimension of unit cell is .

The volume occupied by a single Si atom in the crystal structure is

The concentration of Si atom is

(a)

       =0.001 %

In the single crystal lattice,0.001 % of silicon atoms per unit volume that displaced.

(b)

        %

In the single crystal lattice, of silicon atoms per unit volume that displaced.

as technology advances, new experiments often expose problems in accepted theories. c

hope i

-lavira: )

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.