Abstract
The bulk heterojunction has been widely applied for the construction of efficient organicpolymer solar cells. Typically, the heterojunction is formed as a result of the phasesegregation of the donor and acceptor mixture. Here, we report a study in which,differently than the common annealing approach, efficient bulk heterojunction solar cellswere fabricated using electrochemically grown 3-dimension (3D) poly-3-methyl-thiophene(P3MT) nano-networked structures. Porous and interconnected P3MT (donor)nano-structures were first electrochemically grown on a transparent Au electrode; thenPCBM (acceptor) was infiltrated into the openings of the 3D P3MT nano-structurestructure to form the bulk heterojunction. With this approach, efficient excitondissociation can be realized, and importantly, excellent continuity of both donor andacceptor phases can be accomplished; and proper connection of each phase to thecorresponding electrode is insured, therefore allowing effective collection of the freecarriers. A power conversion efficiency (PCE) of 3.0% has been demonstrated.
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