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Which unintended consequence arises when rapidly annealing a perovskite solar cell absorber layer?

A)Formation of parasitic phases
B)Increased grain boundary passivation
C)Enhanced carrier lifetime uniformity
D)Improved crystal lattice stoichiometry

💡 Explanation

Rapid annealing can cause inhomogeneous heating, and therefore accelerates nucleation via Ostwald ripening, rather than uniform crystal growth. This forms parasitic phases, because larger undesired crystals grow at the expense of smaller desirable ones.

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