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Overcoming Coulombic Traps: Geometry and Electronic Characterizations of Light

254 views · Published 12 January 2015 · 5:48 · Indexed 22 October 2026

Channel: American Chemical Society · 2015 · Science & Technology

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Recent progress is overviewed on experimental elucidations of fundamental molecular functions of the light–energy conversions by the photoactive layers of the organic photovoltalic (OPV) cells by means of the time-resolved electron paramagnetic resonance spectroscopy. Positions and orientations of the unpaired electrons and electronic coupling matrix elements are clarified in photoinduced, primary charge-separated (CS) states. Connections between the molecular geometries and the electronic couplings have been characterized for the initial CS states to elucidate how the structure, orbital delocalization, and molecular libration play roles on exothermic carrier dissociation via a vibrationally relaxed charge-transfer complex with prevention of the energy-wasting charge recombination. Superior functions to biological molecules are presented for the efficient photocurrent generations induced by orbital delocalization and by shallow trap depths at polymer-stacking domains.

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For more information, please visit the Journal of Physical Chemistry Letters website: https://pubs.acs.org/journal/jpclcd 

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