Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

• Main Authors: Reusswig, Philip David (Contributor), Congreve, Daniel Norbert (Contributor), Thompson, Nicholas J. (Contributor), Baldo, Marc A. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science (Contributor), Massachusetts Institute of Technology. Department of Materials Science and Engineering (Contributor)
• Format: Article
• Language: English
• Published: American Institute of Physics (AIP), 2014-03-28T16:45:13Z.
• Subjects: Article
• Online Access: Get fulltext

We demonstrate bilayer organic photovoltaic cells that incorporate a singlet exciton fission sensitizer layer to increase the external quantum efficiency (EQE). This solar cell architecture is realized by pairing the singlet exciton donor layer tris[4-(5-phenylthiophen-2-yl)phenyl]amine (TPTPA) with the singlet exciton fission layer 5,6,11,12-tetraphenylnaphthacene (rubrene). The presence of the rubrene layer at the donor-acceptor interface allows for a singlet generated in TPTPA to undergo singlet exciton fission with a corresponding doubling in the TPTPA EQE from 12.8% to 27.6%. This scheme de-couples singlet exciton fission from photon absorption, exciton diffusion, and charge transport for very high EQE organic photovoltaic cells.
United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-SC0001088)
National Science Foundation (U.S.). Graduate Research Fellowship Program (Grant 1122374)