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p -Conjugated Copolymers for Nanostructured Organic Photovoltaics

p -Conjugated Copolymers for Nanostructured Organic Photovoltaics. Rafael Verduzco Louis Owen Assistant Professor Department of Chemical and Biomolecular Engineering 6100 Main Street, MS-362 Houston, Texas 77005. Objectives.

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p -Conjugated Copolymers for Nanostructured Organic Photovoltaics

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  1. p-Conjugated Copolymers for Nanostructured Organic Photovoltaics Rafael Verduzco Louis Owen Assistant Professor Department of Chemical and Biomolecular Engineering 6100 Main Street, MS-362 Houston, Texas 77005

  2. Objectives • Prepare Block Copolymers with n- and p-type polymers linked together covalently • Study the structure and self-assembly of the copolymers in the bulk, in solution, and in thin films • Investigate the potential improvement of polymeric OPV performance due to nanostructured active layer

  3. p-type block: Poly(3-hexylthiophene) HOMO/LUMO: -4.8/-2.6 eV Can be made with a variety of end groups and with a low (1.1-1.2) pdi. Polymers for Solar Energy • Desired properties: • pdi ~ 1.2 • low bandgap n-type block with good electron mobility • low bandgap p-type block with good hole mobility Scherf, Acc. Chem. Res., ASAP article 2008 Review of organic solar cells: Hoppe, H. et al. J. Mater. Res., 19, 1924 (2004)

  4. n-type block: Poly(benzothiadiazole-co-9,9-dioctyl-fluorene) HOMO/LUMO: -5.68/-3.67 eV (90 % fluorene groups) Lower bandgap, higher e- mobility than polyfluorene Herguth et al., Macromolecules, 35, 6094 (2002). Polymers for Solar Energy • Desired properties: • pdi ~ 1.2 • low bandgap n-type block with good electron mobility • low bandgap p-type block with good hole mobility Scherf, Acc. Chem. Res., ASAP article 2008 Review of organic solar cells: Hoppe, H. et al. J. Mater. Res., 19, 1924 (2004)

  5. Synthesis and Characterization Synthesis via Suzuki Polycondensation for n-type polymer MALDI-TOF MS SEC-RI AFM AFM shows the formation of a nanostructured polymer thin film after annealing at 150 oC

  6. Morphology of p3HT-pF copolymers Thin film morphology of all-conjugated block copolymers, SiO2 surface cast in dichlorobenzene

  7. Current Work • Fabrication of all-polymer OPVs • Synthesis of multi-grafted copolymers for broadband absorption in OPVs • Study of the self-assembly of side-chain conjugated copolymers

  8. Acknowledgments • Rice University School of Engineering Start-up Funding • Louis Owen Foundation • Welch Foundation for Chemical Research • Center for Nanophase Materials Sciences at Oak Ridge National Lab, a Department of Energy Facility

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