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Study of organic photovoltaics by localized concentrated sunlight: Towards optimization of charge collection in large-area solar cells
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8.See supplementary material at http://dx.doi.org/10.1063/1.3656276 for description of the fiber-optic/mini-dish solar concentrator. [Supplementary Material]
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Figures

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FIG. 1.

(Color online) OPV cell under the study. (a) Schematic of device architecture. (b) Photograph of the front surface. (c) Localized illumination of the cell.

Image of FIG. 2.

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FIG. 2.

(Color online) A comparison between J-V curves of the two ITO-free cells (with and without an Ag grid) measured under a simulated one sun irradiation.

Image of FIG. 3.

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FIG. 3.

(Color online) A comparison between the key parameters of uniformly and localized illuminated cells: (a) Jsc , (b) Voc , (c) FF, and (d) PCE. The Voc compensation of the PCE is made by a constant 1.22 factor based on the uniform/localized Voc ratio.

Image of FIG. 4.

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FIG. 4.

(Color online) A comparison between PV performances for the four different contact geometries: (a) Jsc , (b) Voc , (c) FF, and (d) PCE.

Tables

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Table I.

Geometries of the front contact system of the cells. Wide finger width: 325 μm; narrow finger width: 215 μm. Wide bus-bar width: 1800 μm; narrow bus-bar width: 600 μm. Cell 4 shares the same geometry as the cell presented in Figures 1–3.

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/content/aip/journal/apl/99/17/10.1063/1.3656276
2011-10-26
2014-04-18

Abstract

Large-area organic solar cells are known to suffer from a major efficiency decrease which originates from the combination of a voltage drop across the front electrode and the voltage-dependent photocurrent. In this letter, we demonstrate this efficiency loss on large area, indiumtin oxide free cells with a hexagonal current collecting front grid, by measurements of light intensity dependence of the cell performance. The results show a major difference in the cell performance measured under localized and uniform illuminations. Subsequently, we demonstrate ways in which the current collecting efficiency could be raised.

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Scitation: Study of organic photovoltaics by localized concentrated sunlight: Towards optimization of charge collection in large-area solar cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/17/10.1063/1.3656276
10.1063/1.3656276
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