title: Three-dimensional nano-networked P3MT/PCBM solar cells.
abstract: The bulk heterojunction has been widely applied for the construction of efficient organic polymer solar cells. Typically, the heterojunction is formed as a result of the phase segregation of the donor and acceptor mixture. Here, we report a study in which, differently than the common annealing approach, efficient bulk heterojunction solar cells were 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; then PCBM (acceptor) was infiltrated into the openings of the 3D P3MT nano-structure structure to form the bulk heterojunction. With this approach, efficient exciton dissociation can be realized, and importantly, excellent continuity of both donor and acceptor phases can be accomplished; and proper connection of each phase to the corresponding electrode is insured, therefore allowing effective collection of the free carriers. A power conversion efficiency (PCE) of 3.0% has been demonstrated.
authors.affiliation: Department of Electrical and Computer Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA.
authors.forename: He
authors.initials: H
authors.lastname: Gao
authors.forename: Yixuan
authors.initials: Y
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo