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Improving polymer solar cell performances by manipulating the self-organization of polymer
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FIG. 1.

J-V characteristics of conventional and up-side-down nonannealed PSCs: (a) under AM 1.5G illumination and (b) in the dark. J-V characteristics of (c) hole-only devices and (d) electron-only devices. For each type of PSCs, 12 devices were made and characterized. Their performances were shown as error bars.

Image of FIG. 2.

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FIG. 2.

(a) Optical absorption spectra and (b) IPCE of conventional and up-side-down nonannealed devices. Insets (i) and (ii) are schematic diagram of the conventional and up-side-down film, respectively. For each type of PSCs, 12 devices were made and characterized. Their performances were shown as error bars.

Image of FIG. 3.

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FIG. 3.

AFM image of (a) conventional film and (b) up-side-down-film, and 2D GIXRD patterns of (c) conventional film and (d) up-side-down film. (e) is the 1D out of plane of GIXRD result at 00P direction; conventional (black) and up-side-down (red) film. All films are nonannealed and prepared by the slow growth method.

Image of FIG. 4.

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FIG. 4.

J-V characteristics of annealed PSCs with different thicknesses. Inset shows the performances of PSCs. For each type of PSCs, 12 devices were made and characterized. Their performances were shown as error bars.

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/content/aip/journal/apl/98/24/10.1063/1.3599488
2011-06-13
2014-04-16

Abstract

We have investigated driving force effects on the ordering of polymer, which is a key factor of self-assembly of soft materials. By turning the substrate up-side-down, the downward driving force can form in solution film-growth process and affect the self-organization of polymer chains and domains. We introduce Brown’s capillarity theory [J. Polym. Sci., Polym. Phys. Ed.22, 423 (1956)] to describe the film formation. Our results show that the better chain and lamellae packing of polymer make hole transport, carrier balance, and power conversion efficiency of annealed and unannealed devices improve even with thick active-layers as compared to conventional devices.

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Scitation: Improving polymer solar cell performances by manipulating the self-organization of polymer
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/24/10.1063/1.3599488
10.1063/1.3599488
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