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← ScienceWhich issue arises if dopant concentration exceeds the solubility limit during semiconductor fabrication?
A)Increased minority carrier lifetime
B)Formation of unwanted precipitates✓
C)Enhanced band gap energy
D)Improved carrier mobility locally
💡 Explanation
Second-phase precipitates form because exceeding the solubility limit introduces excess dopant atoms into the crystal lattice. This segregation causes phase separation; rather than increasing dopant effectiveness, unwanted precipitates form, because active dopant concentration remains limited.
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