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Organic solar cells with a multicharge separation structure consisting of a thin rubrene fluorescent dye for open circuit voltage enhancement
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Figures

Image of FIG. 1.

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FIG. 1.

MCS device structure of OSCs consisting of a fluorescence dye rubrene or phosphor .

Image of FIG. 2.

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FIG. 2.

(a) characteristics of ITO/pentacene (40 nm)/rubrene (40 nm)/BPhen (10 nm)/Ag. Inset: energy diagram of OSCs with a MSC structure. (b) and (c) are photovoltaic characteristics of OSCs with a thickness of rubrene from 0 to 8 nm. The symbols with a cross present the performances of OSCs with a thin layer from Ref. 13.

Image of FIG. 3.

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FIG. 3.

(a) to (d) are tapping-mode AFM images in of organic films pentacene (40 nm)/rubrene (, 2, 4, and 6 nm) on ITO coated glass. The rms values of surface roughness of these films are 6.35, 5.15, 4.56, and 3.8 nm corresponding to images (a) to (d), respectively.

Image of FIG. 4.

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FIG. 4.

EQE spectra vs thickness of rubrene layer including insets (a) and (b). The solid fitting lines are determined based on optical transfer matrix theory. EQE spectra of pentacene (dotted line), rubrene (dashed line), and (dashed-dotted line) are only for MSC device with 6 nm rubrene layer. Inset (c): light absorption spectrum of and PL spectrum of rubrene.

Tables

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Table I.

Series resistance , integrated photocurrent density of solar cells with a geometry ITO/pentacene/rubrene . Calculated photocurrent density , , and of pentacene, rubrene, and layer are based on OTM theory.

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/content/aip/journal/apl/98/2/10.1063/1.3535603
2011-01-10
2014-04-24

Abstract

Organic solar cells were fabricated by inserting a thin rubrene fluorescent dye between pentacene and fullerene heterojunction with a multicharge separation(MCS) structure, which was adopted to inherently further improve maximum open circuit voltage and power conversion efficiency. The morphology of organic films showed that a more surface roughness of pentacene film could be beneficial for an effective MCS interface, exciton dissociation, and charge carrier transportation. Moreover, a slight improvement of short-circuit current density when adding a 1 or 2 nm rubrene layer was also analyzed in detail based on external quantum efficiency spectra and optical transfer matrix theory.

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Scitation: Organic solar cells with a multicharge separation structure consisting of a thin rubrene fluorescent dye for open circuit voltage enhancement
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/2/10.1063/1.3535603
10.1063/1.3535603
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