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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 125 C22- Diketopyrrolopyrrole:P3HT blend Thin Films for All-Polymer Solar Cells Satish Patil a , Gitish Dutta a , Richard Friend b , Doo-Hyan Ko b a, Indian Institute of Science, SSCU, Indian Institute of Science, Bangalore, 560012, IN b, Cavendish Labratory, University of Cambridge, UK Diketopyrrolopyrrole (DPP) based polymers have recently emerged as a new class of ambipolar materials. 1 In this study, we have synthesized DPP based conjugated polymers with various combination of donor and acceptor segments. By gradually changing the acceptor strength we fine tune the energy levels of polymers suitable for all-polymer solar cell application. We have utilized these polymers for fabricating all-polymer solar cells in combination with P3HT. The blend of P3HT:DPP thin films was systematically investigated for the photovoltaic properties by using various percentage of donor/acceptor combinations. Figure 1 Shows the optical absorption spectra of one such polymer (PIDT-TDPP) blended with P3HT in 1: 1 weight ratio and it nicely covers entire solar spectra. This work reports the progress towards the synthesis of new DPP-based conjugated polymers and the physical properties that governs the OPV performance of these materials in nonfullerene bulk heterojunction devices. References [1] Yuning Li.; Samarendra P. S.; Sonar P. "A High Mobility P-Type DPP-Thieno[3,2- b ]thiophene Copolymer for Organic Thin-Film Transistors". Adv. Mater. 22, 4862–4866 (2010) © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 126 C23 - Fabrication and characterization of thin film Titania as a blocking under layer in organic dye sensitized solar cells with cobalt and ferrocene mediators base by sol-gel method Mahmoud Zendehdel a , Gerrit Boschloo b , Anders Hagfeldt b , Mohammad Hossein Habibi a a, Isfahan university, P.O.Box 117 Chemistry Department University of I, Isfahan, 81745, IR b, Uppsala University, Department of Physical and Analytical Chemistry, Box 259, 5105, Uppsala, Sweden SUMMARY The properties of thin blocking under layer of titania prepared with sol-gel process used to improve the performance of organic dye sensitized nanocrystalline solar cells with cobalt and ferrocene based mediators in two different solvents have been studied. TiO2 blocking layers prepared on fluorine-doped tin oxide coated glass by dip-coating have been characterized by current-voltage (I-V) measurement, IPCE, SEM, Cyclic Voltammetry, Chronoamperometry and Impedance spectroscopy. The results showed that the ability of the blocking layer to prevent the back reaction of electrons with cobalt complex and ferrocene in the electrolyte was excellent with good improvements in open-circuit photovoltage (Voc) and fill factor of the cell (FF). We have designed the new method for assembling of working electrode with minimum misspend of energy and we prepared a DSC with good advantage when faster redox couples such as ferrocene/ferrocenium are employed with using titania blocking layer to limit the rapid interfacial recombination of photoinjected electrons with the oxidized half of the redox couple. INTRODUCTION Dye-sensitized solar cells (DSCs) have received great interest as cost-effective alternatives to silicon-based photovoltaic devices. Identification of the factors limiting the performance of (DSCs) 1 is a key objective of current research, as attempts are made to increase the AM 1.5 solar power efficiency of these cells beyond 12.3 %. 2 In the DSC, light is absorbed by a dye molecule, which is anchored to a mesoporous wide band gap semiconductor, normally TiO2. In the case of these solid-state cells, it has been demonstrated that the fluorine-doped tin oxide (FTO) substrates must be covered by a thin blocking layer of titania 3 in order to prevent efficiency loss due to electron transfer to mediator as a unlike recombination process. Blocking layers are necessary for DSCs that utilize one electron redox systems such as cobalt complexes 4 or for cells using solid organic hole-conducting media. 5 Recently some research have been studied by using a compact blocking layer of oxide deposited on the anode by spray pyrolysis 6 but there are some problems like expending high energy, not simple controlling on diameter of layers and producing of big particle size of titania that lead to decrease the connectivity to mesoporous nanocrystalline layer. We have tried to use simple and effective method like sol-gel for assembeling of working electrode dyesensitized solar cells. 7 EXPERIMENTAL RESULTS Titanium isopropoxide and isopropyl alcohol (i-PrOH) were mixed and stirred at room temperature for 1 h. EAcAc was added to the solution as a chelating agent, and the solution was stirred for 3 h. Water diluted with i-PrOH was then carefully added to the solution for hydrolysis with addition of HNO3 to reach the pH of solution to 3 and this solution was used for coating. Fluorine-doped tin oxide (FTO) glass substrates (Pilkington, TEC15) were cleaned in an ultrasonic bath overnight using (in order) detergent, water, and ethanol. The conducting glass substrates coated in a dipping–withdrawing manner (withdrawing speed: 0.1 mm/s) (one layers) with titanium sol and preheated in 105 °C for 10 min. Mesoporous TiO2 films were prepared with an area of 0.25 cm 2 by screen printing colloidal TiO2 paste (Dyesol DSL 30 NRD- T) and preheating at 120 °C then another time screen printing of scattering TiO2 paste (PST- © SEFIN 2012
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