The compound gallium arsenide is a commonly used semiconductor, having an energy gap E, of 1.43 eV. Its crystal structure is like that of silicon, except that half the silicon atoms are replaced by gallium atoms and half by arsenic atoms. Draw a flattened-out sketch of the gallium arsenide lattice, following the pattern of figure. What is the net charge of the

(a) Gallium and

(b) Arsenic ion core?

(c) Flow many electrons per bond are there?

Transcribed Image Text:

(a) (b) Spin down 2µB Spin up (c)