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Which consequence results when nitrogen vacancies increase within a gallium nitride semiconductor?

A)Decreased band gap and conductivity
B)Increased piezoelectricity and vibration
C)Enhanced thermal runaway robustness
D)Improved etching efficacy and fidelity

💡 Explanation

Defects influence GaN electronic properties; increased nitrogen vacancies create donor levels via **nitrogen vacancy formation**, reducing the band gap and enhancing n-type conductivity because electrons require less energy to move to the conduction band, therefore enhancing conductivity, rather than inducing other piezoelectric or thermal effects.

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