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Suppressing series resistance in organic solar cells by oxygen plasma treatment
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/content/aip/journal/apl/92/23/10.1063/1.2940236
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FIG. 1.

(a) The optical absorption/transmittance of the gold, ZnPc, and silicon layers used in the photovoltaic cell. (b) The IPCE of the device, under short circuit conditions, with and without the oxygen plasma treatments.

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FIG. 2.

(a) The current density-voltage curve shows the performance of devices with and without oxygen plasma treatment. The numbers associated with each curve designate the FF/PCE (in order) of the particular device. The inset shows the current density-voltage curves under dark conditions. (b) The cross-sectional SEM image of the device structure showing the and Au layer thickness. (c) A schematic of the dc plasma system used to generate the plasma.

Image of FIG. 3.

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FIG. 3.

Comparison of the depth profile of oxygen, nitrogen, Zn, and Au distribution from the Au surface to the ZnPc layer measured by XPS on device structures (a) without and (b) with plasma treatment.

Image of FIG. 4.

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FIG. 4.

A depth profile of the Zn core level XPS spectra of the device after plasma treatment of . The plots show the variation of the Zn signal through the top Au layer deep into the silicon substrate.

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2008-06-11
2014-04-17

Abstract

We demonstrate a low series resistance contact of gold (anode)/zinc-phthalocyznine in a reverse organic photovoltaic device aided by oxygen plasma treatment. The power conversion efficiency appreciated from 0.2% to 2.13%, post plasma treatment, predominantly due to the reduction in the series resistance of the device. A depth profile of zinc from x-ray photoelectron spectroscopy study revealed a gold layer with graded zinc composition, instead of pure gold, to be an efficient hole-collector from the organic interface. The zinc alloying of the gold layer has clearly been promoted by the oxygen plasma treatment.

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Scitation: Suppressing series resistance in organic solar cells by oxygen plasma treatment
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/23/10.1063/1.2940236
10.1063/1.2940236
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