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Titanium suboxide as an optical spacer in polymer solar cells
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FIG. 1.

(a) Refractive indices and extinction coefficients (normal incidence). (b) Model calculations of the optical spacer effect (P3HT:PCBM) for two different BHJ thicknesses. (c) Optical spacer effect in (1:4 w/w) composite solar cell. (d) Optical spacer effect varies with the thickness of the layer.

Image of FIG. 2.

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FIG. 2.

(a) Model prediction of the change in absorbance, for BHJ thickness of 55 nm assuming near normal incidence. (b) Experimental results for comparison with (a). (c) Normalized absorption from model for 70-nm-thick P3HT:PCBM (1:0.8) solar cell. (d) IPCE measurements on devices of the same configuration as (c).

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/content/aip/journal/apl/95/1/10.1063/1.3159622
2009-07-07
2014-04-19

Abstract

The use of a layer of titanium suboxide between the bulk heterojunction (BHJ) thin film and the metal contact in “plastic” solar cell has been shown to increase both the short-circuit current and the fill factor. Using a combination of optical modeling and device experiments, we clarify the role of the layer as an optical spacer. For an appropriate choice of the BHJ thickness and composition, the layer can enhance the absorption within the active layer, thereby increasing the photocurrent and the power conversion efficiency.

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Scitation: Titanium suboxide as an optical spacer in polymer solar cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/1/10.1063/1.3159622
10.1063/1.3159622
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