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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 167 C50 - Noval Solar Cell Based on Biopolymer Bayram Kilic a , Didem Omay a , Ergin Kosa b , Huseyin Kizil c , Levent Trabzon b a, Yalova University, Department of Energy System Engineering, Sehit Omer Faydalý street, No:254, Yalova, TR b, Istanbul Technical University, Mechanical Engineering Department, Inonu street, No: 65 Gumussuyu/ Istanbul, 34437, TR c, Istanbul Technical University, Metallurgy and Materials Science Engineering Department, ITU Ayazaga Kampusu, Maslak/Istanbul, 34469, TR We have grown solar cells by ZnO nanowire, nanorod and nanoflower semiconductors on chitosan based biopolymer for investigation solar cell efficiency of nano-biopolymers. A possible model of 1-D and 3-D architectures self-assembled with biopolymer assistance is presented using minimum energy considerations. We characterized the nano-structures by Scanning electron microscopy, X-ray diffraction, Fourier Transform Infrared Spectroscopy, and Energy Dispersive X-ray analyses. We found that novel 1-D and 3-D architectures are built from high-purity ZnO nanostructures with chitosan based biopolymer structure. The highest solar conversion efficiency of 4% and IPCE of 35% was obtained using ZnO nanoflowers/N719 dye/I - /I - 3electrolyte. The corresponsding solar conversion efficiency and IPCE values were 2.5% and 25% for ZnO nanowires and 1.59% and 18% for the nanorods structures, respectively. Keywords: Dye Sensitized Solar Cell,ZnO, Biopolymer, Nanowires, Nanorods, Nanoflower © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 168 C51 - Oligomers and alternating copolymers designed for bulk heterojunction solar cells: synthesis, opto-electronic properties and device performances. Renaud Demadrille a , Zaireen Yahya a , Evan Spadafora a , Benjamin Grevin a , Mathieu Linares b , Patrice Rannou a , Adam Pron a , Remi Debettignies c , Jean-Pierre Travers a a, CEA-INAC-SPRAM, 17 rue des Martyrs , Grenoble, 38054, FR b, Department of Computational Physics, IFM, Linkoping University, S-58183, Linkoping, Sweden, SE c, INES-CEA-RDI-DTS, Laboratoire Cellules Solaires, Le Bourget du Lac, Technolac Chambery, F-73370, France, FR Nanostructured bulk heterojunctions (BHJ) solar cells, which consist of pi-conjugated oligomers or polymers as electron donors and fullerenes as electron acceptors, are very promising in view of their relatively high power conversion efficiency. The inherent advantages of organic materials such as their light weight and low cost, and the possibility of fabricating large active area devices facilitated by their solution processability, have stimulated intensive research in this field during the last decade. Up to now, BHJ solar cells employing pi-conjugated oligomers or polymers have demonstrated power conversion efficiencies of ca. 6.7% and 8.3% respectively [1-2]. However, further improvement in the device performance could be expected, by developping new materials better matching the solar spectrum and more efficiently converting the sunlight to electricity. In the first part of this communication, we will discuss the design rules and the synthesis of new solution processable oligomers suitable for the use as active components in molecular BHJ solar cells. Their design is based on the combination of tailor-made oligothiophene segments as peripheral electron-donor subunits and indacenodithiophenone, benzothiadiazole or fluorenone as central electron-withdrawing units [3]. The use of this strategy which results in a significant extension of the absorption spectral range, affords the possibility to finely tune the energy levels position and the value of their band gap. We will discuss basic supramolecular chemistry concepts enabling the preparation of molecular nanowires [4-5] and the fabrication of nanostructured composites using these oligomers. Figure 1 Chemical structures of fluorenone-based oligomer and polymer studied in this work. In the second part, we will demonstrate that some of these oligomers can also be considered as smart building blocks to achieve the synthesis of copolymers showing perfectly controlled structures, well-suited for solar cells applications. In the final part, optoelectronic properties of the materials will be described in details and their electrical performances in devices will be discussed [6]. Promising reliminary results demonstrate high open circuit voltages (of ca. 0.8-0.9V) and power conversion efficiencies up to 2.2% for tested devices with an active area of 0.28 cm². © SEFIN 2012
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