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15 Oct 2012

Volume 101, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 101, 161105 (2012); http://dx.doi.org/10.1063/1.4744947 (4 pages)

Nan Niu, Tsung-Li Liu, Igor Aharonovich, Kasey J. Russell, Alexander Woolf, Thomas C. Sadler, Haitham A. R. El-Ella, Menno J. Kappers, Rachel A. Oliver, and Evelyn L. Hu
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Nanopatterned front contact for broadband absorption in ultra-thin amorphous silicon solar cells

Inès Massiot, Clément Colin, Nicolas Péré-Laperne, Pere Roca i Cabarrocas, Christophe Sauvan, Philippe Lalanne, Jean-Luc Pelouard, and Stéphane Collin

Appl. Phys. Lett. 101, 163901 (2012); http://dx.doi.org/10.1063/1.4758468 (3 pages) | Cited 2 times

Online Publication Date: 15 October 2012

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Broadband light trapping is numerically demonstrated in ultra-thin solar cells composed of a flat amorphous silicon absorber layer deposited on a silver mirror. A one-dimensional silver array is used to enhance light absorption in the visible spectral range with low polarization and angle dependencies. In addition, the metallic nanowires play the role of transparent electrodes. We predict a short-circuit current density of 14.6 mA/cm2 for a solar cell with a 90 nm-thick amorphous silicon absorber layer.
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88.40.jj Silicon solar cells
88.40.hj Efficiency and performance of solar cells

Light trapping with total internal reflection and transparent electrodes in organic photovoltaic devices

Kristofer Tvingstedt, Zheng Tang, and Olle Inganäs

Appl. Phys. Lett. 101, 163902 (2012); http://dx.doi.org/10.1063/1.4759125 (5 pages) | Cited 1 time

Online Publication Date: 16 October 2012

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Herein, we demonstrate a method to build highly efficient light trapping structures for printed organic solar cells and modules, compatible with roll to roll manufacturing. Echelle grating structures in combination with semitransparent electrodes allow for efficient light trapping via means of total internal reflection. With this method, we demonstrate an increased cell photocurrent response up to 24%, compared to a standard cell configuration with a planar reflector. The demonstrated light trapping approach is expected to be even more useful for photovoltaic modules, where light hitting “dead areas” in between the sub-cells comprising the module will now be utilized.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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