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← ScienceWhich outcome occurs when a growing crystal of gallium arsenide (GaAs) is excessively doped with silicon?
A)Formation of compensating point defects✓
B)Increased second phase precipitation
C)Formation of Kirkendall voids
D)Enhanced crystal grain boundary segregation
💡 Explanation
Compensating point defects form because silicon can substitute for both Ga and As, acting as either a donor or an acceptor; therefore, excessive silicon doping leads to both n-type and p-type doping rather than simply increasing carrier concentration.
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