Using Resonance Energy Transfer to Improve Exciton Harvesting in Organic–Inorganic Hybrid Photovoltaic Cells


  • The authors acknowledge the Global Climate and Energy Project, DARPA, and the US Department of Energy through the Molecular Foundry, Lawrence Berkeley National Laboratory for support of this research. M.  A. S. acknowledges an Alternative Energy Fellowship from the ACS Petroleum Research Fund.


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The effective exciton diffusion length of poly(3-hexylthiophene) (P3HT) can be improved with resonance-energy transfer from P3HT to poly(N-dodecyl-2,5-bis(2'-thienyl)pyrrole-2,1,3-benzothiadiazole) (PTPTB), a low-bandgap polymer, which results in a threefold increase of the photocurrent. Directional resonance energy transfer to the exciton-splitting interface has the potential to overcome a number of limitations associated with exciton transport in polymer photovoltaic cells.