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Which condition sharply decreases photocurrent when sodium iodide perovskite solar cells are deployed?

A)Increased ambient partial water vapor
B)High concentration of intrinsic defects
C)Electron-hole recombination near electrodes
D)Elevated operational current density

💡 Explanation

High water vapor causes rapid ion migration because the hydration reduces activation energy, destabilizing the ionic bonds in the perovskite lattice and resulting in structural degradation. Therefore, ambient water degrades performance, rather than intrinsic crystal defects changing the cell bandgap.

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