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Inverted organic solar cells comprising a solution-processed cesium fluoride interlayer
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FIG. 1.

JV characteristics of ITO/CsF/P3HT:PCBM/PEDOT:PSS/Al (inset) polymer solar cells with varying CsF layer thicknesses corresponding to different solid contents in solutions as depicted.

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FIG. 2.

vs applied bias voltage at the aluminum cathode of ITO/CsF/P3HT:PCBM/PEDOT:PSS/Al solar cells. The capacitance was recorded at a frequency of 3 kHz. The solid lines correspond to linear fits in the range of Mott-Schottky behavior with the parameters and .

Image of FIG. 3.

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FIG. 3.

SIMS depth profiles of an ITO/CsF (2 g/L)/P3HT:PCBM/PEDOT:PSS/Al device. The Al profile was measured with SNMS. The signal intensities of and of devices without CsF are below the detection limit (data not shown).

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/content/aip/journal/apl/98/5/10.1063/1.3548860
2011-02-04
2014-04-20

Abstract

We investigate the influence of solution-processed cesium fluoride (CsF) interlayers on the performance of inverted polymersolar cells comprising a blend of poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl -butyric acid methyl ester. The thickness of the CsF layer is optimized in terms of current-voltage characteristics by a variation of the solid content in solution. Capacitance-voltage characteristics reveal a shift of the built-in voltage at the cathode interface by about 0.3 V as compared to devices without a CsF layer, giving rise to an increase in open-circuit voltage by the same value. The vertical distribution of and ions is studied by secondary ion mass spectroscopy, indicating a strong diffusion of the alkaline fluoride into the organic layer stack.

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Scitation: Inverted organic solar cells comprising a solution-processed cesium fluoride interlayer
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/5/10.1063/1.3548860
10.1063/1.3548860
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