Dr. Emre Yengel Profile

Dr. Emre Yengel

at Çankaya Univ

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Publications (2)

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Proceedings Article | 5 September 2015 Presentation + Paper

Theoretical limits of the multistacked 1D and 2D microstructured inorganic solar cells

Emre Yengel, Hakan Karaagac, Logeeswaran VJ, M. Saif Islam

Proceedings Volume 9561, 956103 (2015) https://doi.org/10.1117/12.2188355

KEYWORDS: Solar cells, Silicon, Germanium, Absorption, Semiconductors, Crystals, Reflection, Semiconducting wafers, Thin films, Manufacturing

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Recent studies in monocrystalline semiconductor solar cells are focused on mechanically stacking multiple cells from different materials to increase the power conversion efficiency. Although, the results show promising increase in the device performance, the cost remains as the main drawback. In this study, we calculated the theoretical limits of multistacked 1D and 2D microstructered inorganic monocrstalline solar cells. This system is studied for Si and Ge material pair. The results show promising improvements in the surface reflection due to enhanced light trapping caused by photon-microstructures interactions. The theoretical results are also supported with surface reflection and angular dependent power conversion efficiency measurements of 2D axial microwall solar cells. We address the challenge of cost reduction by proposing to use our recently reported mass-manufacturable fracture-transfer- printing method which enables the use of a monocrystalline substrate wafer for repeated fabrication of devices by consuming only few microns of materials in each layer of devices. We calculated thickness dependent power conversion efficiencies of multistacked Si/Ge microstructured solar cells and found the power conversion efficiency to saturate at 26% with a combined device thickness of 30 μm. Besides having benefits of fabricating low-cost, light weight, flexible, semi-transparent, and highly efficient devices, the proposed fabrication method is applicable for other III-V materials and compounds to further increase the power conversion efficiency above 35% range.

Proceedings Article | 20 August 2009 Paper

Effects of DNA and Pt-DNA electrodes on bulk heterojuction solar cells

Emre Yengel, Liang Wang, Mihrimah Ozkan, Cengiz Ozkan

Proceedings Volume 7411, 74110B (2009) https://doi.org/10.1117/12.826802

KEYWORDS: Solar cells, Platinum, Nanostructures, Electrodes, Nanoparticles, Polymers, Atomic force microscopy, Nanolithography, Glasses, Nanowires

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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 (I_sc) is observed for the DNA containing network. Similar improvements in both I_sc and the open circuit voltage (V_oc) 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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