Photovoltaic performance and morphology of polyfluorene blends: The influence of phase separation evolution

Rafi Shikler; Marco Chiesa; Richard H. Friend

doi:10.1021/ma060421m

Photovoltaic performance and morphology of polyfluorene blends: The influence of phase separation evolution

Rafi Shikler, Marco Chiesa, Richard H. Friend

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

We report the composition profile in blends of hole-accepting and electron-accepting polyfluorenes. During solvent evaporation to form thin (∼150 nm thickness) solid films, demixing of the polymers produces micrometer scale lateral phase separation. We show here that demixing is more complete in regions closer to the interface between the two phases. We propose that carriers transport is easier in these regions than in the bulk. We show how this affects the photovoltaic efficiency of diodes made with these blends, which show a linear dependence of efficiency on the length of the interface between the phases.

Original language	English
Pages (from-to)	5393-5399
Number of pages	7
Journal	Macromolecules
Volume	39
Issue number	16
DOIs	https://doi.org/10.1021/ma060421m
State	Published - 8 Aug 2006
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma060421m

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abstract = "We report the composition profile in blends of hole-accepting and electron-accepting polyfluorenes. During solvent evaporation to form thin (∼150 nm thickness) solid films, demixing of the polymers produces micrometer scale lateral phase separation. We show here that demixing is more complete in regions closer to the interface between the two phases. We propose that carriers transport is easier in these regions than in the bulk. We show how this affects the photovoltaic efficiency of diodes made with these blends, which show a linear dependence of efficiency on the length of the interface between the phases.",

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AB - We report the composition profile in blends of hole-accepting and electron-accepting polyfluorenes. During solvent evaporation to form thin (∼150 nm thickness) solid films, demixing of the polymers produces micrometer scale lateral phase separation. We show here that demixing is more complete in regions closer to the interface between the two phases. We propose that carriers transport is easier in these regions than in the bulk. We show how this affects the photovoltaic efficiency of diodes made with these blends, which show a linear dependence of efficiency on the length of the interface between the phases.

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Photovoltaic performance and morphology of polyfluorene blends: The influence of phase separation evolution

Abstract

ASJC Scopus subject areas

UN SDGs

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