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← ScienceWhich outcome occurs when an electron encounters grain boundaries within polycrystalline silicon used in solar panels?
A)Increased electron-hole recombination rate✓
B)Enhanced quantum tunneling probability
C)Decreased phonon scattering events
D)Augmented electrical conductivity uniformly
💡 Explanation
Increased electron-hole recombination results, because grain boundary defects introduce energy states within the band gap, enabling trap-assisted recombination, therefore reducing solar panel efficiency rather than enhancing conduction, because fewer free carriers survive.
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