2. a) A) Find the number of atoms per square centimeter in silicon in the (100)...

2. a) A) Find the number of atoms per square centimeter in silicon in the (100) (110) and (111) planes.

b) A unit cell of GaAs is shown as below. Calculate the density of GaAs (a=5.65 Angstrom, and the atomic weights of Ga and As are 69.72 and 74.92 g/mol, respectively).

c) How many valence electrons are in a tin atom? How many valence electrons are in a Ga atom and an As atom, respectively? A GaAs sample doped with tin. If the tin substitutes Ga atoms in crystal lattice, are donors or acceptors formed? Is the semiconductor n- or p-type?

Expert Solution

2c The valence electrons in Ga =3, Sn=4, As=5

If GaAs is doped with tin then Ga as an acceptor dopant and tin Sn is a net donor.

It was observed that after doping it was changed from n-type semiconductor to p-type semiconductor.

2b. Atomic density = N/A

2a. To find th number of atoms per sq cm of silicon in difernt planes

queen_honey_blossom answered 2 years ago

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