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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 75 with the micro/nano-structure of P3HT and to further deepen our understanding on the DB device, we report a systematic characterisation, which comprises cross-section scanning electronic microscopy images and transient photoluminescence measurements. References [1]Riede, M.K.; Sylvester-Hvid, K.O.; Glatthaar, M.; Keegan, N.; Ziegler, T.; Zimmermann, B.; Niggemann, M.; Liehr, A.; Willeke, G.; Gombert, A. “High throughput testing platform for organic solar cells”. Prog. Photovolt: Res. Appl. 2008, (2008). [2]Lee, K.H.; Schwenn, P.E.; Smith, A.R.G.; Cavaye, H.; Shaw, P.E.; James, M.; Krueger, K.B.; Gentle, I.R.; Meredith, P.; Burn, P.L. ”Morphology of all-solution-processed "bilayer" organic solar cells”. Adv. Mater. 23, (2011). © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 76 B33- Enhanced Light Harvesting in Dye-Sensitized Solar Cells Using Highly Soluble Energy Relay Dyes George Margulis a , Bo Gyu Lim b , Brian Hardin b , Johann Feckl d , Shaik Zakeerudin c , Thomas Bein d , Michael Grätzel c , Alan Sellinger b , Michael McGehee b a, Applied Physics, Stanford University, Stanford, Ca, 94305, US b, Materials Science and Engineering, Stanford University, Stanford, Ca. 94305, US c, Laboratory of Photonics and Interfaces, Ecole Polytechnique de Lausanne, Lausanne, Switzerland d, Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Munich, Germany Energy Relay Dyes (ERDs) have been utilized in dye sensitized solar cells (DSCs) to enhance light harvesting through complementary absorption with subsequent long-range Förster resonance energy transfer to a sensitizing dye(1). This new paradigm allows for a relaxation DSC of design principles: the ERD is given the task of light absorption, while efficient charge injection and recombination reduction is left to the sensitizing dye. However, the efficiency of ERD DSCs is limited by insufficient absorption by the ERD. To significantly improve performance, either the solubility and/or extinction coefficient of the ERD must be improved significantly(2). We present a new electrolyte and highly soluble ERDs which allow for near 100% absorption at peak wavelength even in 3 micron-thick DSCs. Figure 1 Normalized EQE of 3 micron DSC sensitized with TT1 using no ERD (blue) and BL302 ERD (green) These highly soluble energy relay dyes allow for a greater than 50% enhancement in the short circuit photocurrent of the DSC, greatly improving performance. In addition, we measure and quantify the effects of concentration quenching and electrolyte quenching, mechanisms which lower the energy transfer efficiency of ERDs to sensitizing dyes. We are able to achieve 80% energy transfer efficiency in 3 micron thick DSCs with near unity absorption by the energy relay dye, showing the potential for the use of energy relay dyes for highly efficient light harvesting. References [1]Hardin, B.E.; Hoke, E.T.; Armstrong P.B.; Yum J.-H.; Comte, P.; Torres, T.; Fréchet, J.M; Nazeeruddin, M.K.; Grätzel, M. McGehee, M.D. “Increasing Light Harvesting in Dye-Sensitized Solar Cells With Energy Relay Dyes”. Nat. Phot. 3, 406-411 (2009). © SEFIN 2012
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