Chemistry Seminar Series: Professor Gregory WelchExport this event to calendar

Tuesday, September 18, 2012 — 2:30 PM EDT

Molecular materials for solution processed organic solar cells

Professor Gregory Welch
Department of Chemistry
Dalhousie University

Tuesday, September 18, 2012
2:30 p.m.
C2-361 (Reading Room)

Abstract: Solution processed organic photovoltaic devices (OPVs) have emerged as a promising energy technology due to their ease of fabrication, potential to enable low-cost manufacturing, and ability to be incorporated onto light-weight flexible substrates.1,2 The most successful class of OPV devices are those with active layers composed of blended molecular3 or polymeric4 electron donor and fullerene acceptor, widely known as bulk heterojunction (BHJ) solar cells.5 Recently, we have reported on the synthesis of a new class of molecular donors with favorable optical and electronic properties for use in OPV devices.6,7 When coupled with the electron acceptor [6,6]-phenyl-C71-butyric acid methyl esters PC71BM, record power conversion efficiencies (PCE) over 7% have been realized.8 This presentation will describe how these new molecular donor materials came to be, the key parameters for achieving high PCEs, and comment on current challenges and future directions.

  1. Beaujuge, P. M.; Fréchet, J. M. J. J. Am. Chem. Soc., 2011133 (50), 20009–20029. (Review)
  2. Thompson, B. C.; Frechet, J. M. J. Angewandte Chemie-International Edition 2008, 47, 58-77. (Review)
  3. Mishra A.; Bauerle, P. Angewandte Chemie-International Edition 2012, 51, 2020-2067. (Review)
  4. Leclerc, M. Energy Environ. Sci., 2011, 4, 1225-1237. (Review)
  5. Dennler, G.; Scharber, M. C.; Brabec, C. J. Adv. Mater. 2009, 21, 1323–1338. (Review)
  6. Welch, G. C.; Perez, L. A.; Hoven, C. V.; Zhang, Y.; Dang, X. D.; Sharenko, A.; Toney, M. F.; Kramer, E. J.; Nguyen, T. Q.; Bazan, G. C. J. Mater. Chem. 2011, 21, 12700-12709.
  7. Henson, Z.; Welch, G. C.; van der Poll, T.; Bazan,; J. Am. Chem. Soc., 2012, 134, 3766-3769.
  8. Sun, Y.; Welch, G. C.; Leong, W. L.; Takacs, C. J.; Bazan, G. C.; Heeger, A. J. Nature Materials 2011, 44–48.

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