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← ScienceWhich constraint causes reduced efficiency in photovoltaic energy conversion using polycrystalline silicon wafers?
A)Increased electron-hole recombination rate✓
B)Augmented phonon scattering events
C)Elevated crystal lattice symmetry
D)Restricted electron mean free path
💡 Explanation
Grain boundaries in polycrystalline silicon increase defects, so electrons and holes recombine faster due to increased trap states via Shockley–Read–Hall recombination. This limits charge carrier collection; therefore, efficiency reduces, rather than alternative effects like increased phonon scattering influencing thermal losses.
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