Which risk primarily arises in a gallium arsenide (GaAs) field-effect transistor caused by impurities altering band structure?

💡 Explanation

Reduced electron mobility results from increased impurity scattering. The **Anderson localization** mechanism alters the band structure by introducing localized states within the band gap, because this disrupts electron transport. Therefore, mobility is reduced, rather than conductivity being enhanced or gate being affected.

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