Question: 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,

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?

(a) (b) Spin down 2B Spin up (c)

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