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20 August 2009 Effects of DNA and Pt-DNA electrodes on bulk heterojuction solar cells
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Employing DNA molecules provide opportunities for electronics and photonics applications, serving to enhance the device properties as active part of the device or being a linker agent to aid in the self assembly of nanostructures. In this work, the effects of two different sets of biological materials, stand alone DNA sequences and Pt-DNA nanowires on the device properties of bulk heterojunction solar cell devices are being investigated. During the metallization of DNA, a Pt ion activation process over the DNA backbone is followed by a reduction process, where positively charged Pt nanoparticles are assembled on the DNA sequences to form the Pt-DNA complexes via sequential ionic reduction. Pt nanowires 20 nm in diameter are obtained by optimization of the salt reduction parameters of this. Several solar cell devices consisting of Al/P3HT:PCBM/PEDOT:PSS/ITO layers, are fabricated where DNA sequences or the Pt-DNA nanostructures are placed in between the P3HT:PCBM and the PEDOT:PSS layers. Both DNA sequences and Pt-DNA nanostructures are spray coated onto the PEDOT:PSS layer before spin-coating the PEDOT:PSS polymer mixture. The effects of the DNA and Pt-DNA nanostructures are observed from the I-V characteristics under the standard AM1.5G 1 Sun Test Condition. We observe that both DNA sequences and Pt-DNA nanostructures improve the power conversion efficiency (PCE) by %12 and %25 respectively. We believe that this increase in PCE is provided by the enhancement of hole collection and a reduction of the recombination loses. In addition, improvement in the short circuit current (Isc) is observed for the DNA containing network. Similar improvements in both Isc and the open circuit voltage (Voc) are observed for the Pt-DNA containing network. We hypothesize that while the high resistance of the DNA network limits charge collection, comparably low resistance Pt-DNA network improves this feature.
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Emre Yengel, Liang Wang, Mihrimah Ozkan, and Cengiz S. Ozkan "Effects of DNA and Pt-DNA electrodes on bulk heterojuction solar cells", Proc. SPIE 7411, Nanoscale Photonic and Cell Technologies for Photovoltaics II, 74110B (20 August 2009);

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