Abstract
By directly probing the electric field changes across the fullerene active layer with time-resolved optical second harmonic (SH) generation method, the selective carrier accumulation processes at organic/organic interfaces in an Au/pentacene/fullerene/polyimide/indium tin oxide triple-layer device were revealed. On the basis of the Maxwell-Wagner effect, it was shown that injected holes preferably accumulated at the pentacene/fullerene interface, resulting in a fast increase of the generated SH intensity around 10−5 s; while the injected electrons transported until to the fullerene/polyimide interface, resulting in a delayed decrease of the SH intensity after 10−3 s.
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