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← ScienceWhich property change occurs when organic semiconductor molecules form crystalline structures?
A)Increased exciton diffusion length✓
B)Reduced charge carrier mobility
C)Decreased optical absorption range
D)Enhanced molecular vibrational freedom
💡 Explanation
Crystallization aligns molecules, favoring intermolecular electronic coupling; therefore, exciton diffusion length increases via Förster resonance energy transfer because aligned molecules facilitate efficient energy transfer, rather than inhibiting it.
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