Which mechanism causes lowered solar cell efficiency because of grain boundaries?

💡 Explanation

Increased electron-hole recombination decreases efficiency because the grain boundaries disrupts the crystal lattice periodicity, enabling non-radiative transitions via the Shockley-Read-Hall recombination mechanism; therefore fewer photo-generated carriers reach contacts, rather than increased carrier momentum.

• Which outcome occurs when multiple quantum wave functions describing identical fermions overlap significantly?
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