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5 Nov 2012

Volume 101, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 101, 193101 (2012); http://dx.doi.org/10.1063/1.4764508 (4 pages)

Ryan T. Tucker, Allan L. Beaudry, Joshua M. LaForge, Michael T. Taschuk, and Michael J. Brett
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What is the useful energy of a photon?

Tom Markvart and Gottfried H. Bauer

Appl. Phys. Lett. 101, 193901 (2012); http://dx.doi.org/10.1063/1.4766177 (3 pages)

Online Publication Date: 7 November 2012

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The fundamental upper bound on the efficiency of photovoltaic conversion continues to attract interest of the research community. By considering the conversion efficiency of a monochromatic photon gas at constant pressure, we show that this limit is equal to the availability (or exergy), as defined in textbooks on classical thermodynamics. The application of this result to the full spectrum of black-body radiation yields the Petela-Press-Landsberg efficiency. Generalization to include entropy generation on account of the kinetic nature of the conversion process, by drawing a parallel with the efficiency of an infinite tandem converter, yields a theoretical efficiency limit of 85.2%.
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88.40.hj Efficiency and performance of solar cells

Plasmonic-enhanced performance for polymer solar cells prepared with inverted structures

Chuan-Sheng Kao, Fang-Chung Chen, Ching-Wen Liao, Michael H. Huang, and Chain-Shu Hsu

Appl. Phys. Lett. 101, 193902 (2012); http://dx.doi.org/10.1063/1.4766736 (4 pages)

Online Publication Date: 9 November 2012

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We incorporated gold nanoparticles (Au NPs) in inverted organic photovoltaic devices to enhance the device performance. The photocurrent and fill factors were improved after the addition of Au NPs into the Cs2CO3 buffer layer. The photoluminescent measurements revealed a significant increase of light absorption of the photoactive layer. We attribute the improvement to local field enhancement induced by the localized surface plasmon resonance. Further, through the study of the morphologies of the cathode interfaces, we found that the rough surfaces might increase the device resistances. This drawback, however, was overwhelmed by the advantageous plasmonic effects.
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88.40.H- Solar cells (photovoltaics)
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