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ZnO:Al cathode for highly efficient, semitransparent 4% organic solar cells utilizing TiO x and aluminum interlayers
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FIG. 1.

(Color online) Current-voltage characteristics for thin semitransparent solar cells showing an improving short circuit current for increasing ALI thickness (best device (13 nm Al): PCE 4.2%, 864 mV, j SC 9.34 mA/cm2, and FF 53%). The IV-curve of a pure aluminum cathode is also shown and can be regarded as a limit for thin semitransparent solar cells.

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FIG. 2.

(Color online) An increasing ALI thickness raises short circuit current and efficiency of devices with thin active layers. Thick absorber layers are less dependent on the average integrated (300-900 nm) ALI reflectance due to their improved absorption.

Image of FIG. 3.

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FIG. 3.

(Color online) (a) Reflectance and average integrated reflectance values of different ALI/ZAO cathodes sputtered on glass. (b) The transmittance for complete solar cells is decreasing for increasing ALI thickness while the cathode’s reflectance raises and improves the absorption of thin absorber layers which are converging the thick absorber layer’s absorption profile. Inset: average PCE and j SC.

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/content/aip/journal/apl/100/7/10.1063/1.3685718
2012-02-15
2014-04-21

Abstract

We report on the fabrication of highly efficient, semitransparent bulk heterojunction solar cells comprising poly[[9-(1-octylnonyl)-9h-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT) blended with [6,6]-phenyl-C71-butyric acid methyl (PC71BM) esters as active layer. As semitransparent cathodesputteredaluminum doped ZnO was used in combination with a sputter damage preventing, thin (8 nm) TiO x layer processed from solution and a sputteredaluminum interlayer (ALI). The short circuit current improves for thicker ALIs due to increased reflectance at the cathode leading to average efficiencies of 4.0% for semitransparent solar cells. Comparable results (3.9%) were achieved for devices comprising thick absorbers and thin ALIs.

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Scitation: ZnO:Al cathode for highly efficient, semitransparent 4% organic solar cells utilizing TiOx and aluminum interlayers
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/7/10.1063/1.3685718
10.1063/1.3685718
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