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Simple tandem organic photovoltaic cells for improved energy conversion efficiency
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Figures

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FIG. 1.

(a) Schematic structure of the proposed tandem PV cell. In this structure, PCBM is used simultaneously to form the CuPc/PCBM bilayer heterojunction subcell and the P3HT:PCBM bulk heterojunction subcell. (b) Energy diagram of the proposed tandem PV cell. (c) A simple equivalent circuit model of the proposed tandem PV cell. The extra resistor indicates the fact that holes generated in the blend layer have to be transported across the CuPc layer.

Image of FIG. 2.

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FIG. 2.

UV-visible absorption spectra of P3HT:PCBM , CuPc , and CuPc /P3HT:PCBM structures. The absorption bands of P3HT:PCBM and CuPc complement each other and, by combining these materials in the proposed tandem PV cell, the absorption spectrum covers almost the entire visible range.

Image of FIG. 3.

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FIG. 3.

(a) characteristics of three types of devices. Stand-alone bilayer heterojunction cell: ITO/PEDOT:PSS/CuPc/PCBM/Al. Stand-alone blend bulk heterojunction cell: ITO/PEDOT:PSS/P3HT:PCBM/Al. Proposed tandem PV cell: ITO/PEDOT:PSS/CuPc/P3HT:PCBM/Al. Ideal cell: a theoretical cell with the sum of photocurrents of the stand-alone bilayer heterojunction cell and the blend bulk heterojunction cell. The illumination intensity is (AM 1.5G). (b) Dependence of on the CuPc film thickness in the proposed tandem PV cell. P3HT:PCBM layer is kept constant at . Device structure: ITO/PEDOT:PSS/CuPc/P3HT:PCBM/Al.

Image of FIG. 4.

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FIG. 4.

Statistical properties of the (a) and the PCE (b). Bilayer cell: stand-alone CuPc/PCBM bilyar heterojunction PV cell. BHJ cell: stand-alone P3HT:PCBM bulk heterojunction PV cell. Proposed tandem cell: CuPc/P3HT:PCBM PV tandem cell.

Tables

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Table I.

Summary of electrical properties of stand-alone CuPc/PCBM and P3HT:PCBM PV cells, the proposed tandem PV cell, and the ideal cell.

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/content/aip/journal/apl/92/8/10.1063/1.2885721
2008-02-28
2014-04-25

Abstract

We proposed and demonstrated a simple tandem structure of organic photovoltaic(PV)cell for efficient light harvesting. In this device structure, a soluble fullerene derivative of [6,6]-phenyl--butyric acid methyl ester (PCBM) is employed simultaneously to form a bilayer heterojunctionPV subcell with the underlying copper phthalocyanine (CuPc) and a bulk heterojunctionPV subcell with blended poly(3-hexylthiophene-2,5-diyl) (P3HT). In comparison with the conventional tandem structure, the omission of the semitransparent intercellular connection layer reduces the complexity of the device and the light loss. The enhanced short circuit current density and power conversion efficiency (PCE) (2.79%) of the tandem structure are nearly the sum of those of the stand-alone cells of CuPc/PCBM (, ) and P3HT:PCBM (, ).

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Scitation: Simple tandem organic photovoltaic cells for improved energy conversion efficiency
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/8/10.1063/1.2885721
10.1063/1.2885721
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