The relationship between the electric field-induced dissociation of charge transfer excitons and the photocurrent in small molecular/polymeric solar cells

Sahika Inal; Marcel Schubert; Alan Sellinger; Dieter Neher

doi:10.1021/jz100121t

The relationship between the electric field-induced dissociation of charge transfer excitons and the photocurrent in small molecular/polymeric solar cells

Sahika Inal, Marcel Schubert, Alan Sellinger, Dieter Neher^*

^*Corresponding author for this work

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

52 Scopus citations

Abstract

A bulk heterojunction system consisting of a soluble poly(p- phenylenevinylene) donor and a small molecular electron acceptor based on Vinazene (2-vinyl-4,5-dicyanoimidazole) has been investigated with respect to the correlation between field-induced emission quenching and free charge carrier formation. Transient and steady-state emission properties measured at different voltages indicate that emissive charge transfer (CT) excitons formed at the heterojunction are prone to direct field-induced dissociation. However, the split-up of these CT excitons cannot fully account for the photocurrents observed on the very same devices. It is proposed that the formation of free carriers involves a nonemissive precursor and that the recombination of this precursor does not proceed via the formation of CT excitons.

Original language	English (US)
Pages (from-to)	982-986
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	1
Issue number	6
DOIs	https://doi.org/10.1021/jz100121t
State	Published - Mar 18 2010
Externally published	Yes

Keywords

Macromolecules
Soft matter

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/jz100121t

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abstract = "A bulk heterojunction system consisting of a soluble poly(p- phenylenevinylene) donor and a small molecular electron acceptor based on Vinazene (2-vinyl-4,5-dicyanoimidazole) has been investigated with respect to the correlation between field-induced emission quenching and free charge carrier formation. Transient and steady-state emission properties measured at different voltages indicate that emissive charge transfer (CT) excitons formed at the heterojunction are prone to direct field-induced dissociation. However, the split-up of these CT excitons cannot fully account for the photocurrents observed on the very same devices. It is proposed that the formation of free carriers involves a nonemissive precursor and that the recombination of this precursor does not proceed via the formation of CT excitons.",

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T1 - The relationship between the electric field-induced dissociation of charge transfer excitons and the photocurrent in small molecular/polymeric solar cells

AU - Inal, Sahika

AU - Schubert, Marcel

AU - Sellinger, Alan

AU - Neher, Dieter

PY - 2010/3/18

Y1 - 2010/3/18

N2 - A bulk heterojunction system consisting of a soluble poly(p- phenylenevinylene) donor and a small molecular electron acceptor based on Vinazene (2-vinyl-4,5-dicyanoimidazole) has been investigated with respect to the correlation between field-induced emission quenching and free charge carrier formation. Transient and steady-state emission properties measured at different voltages indicate that emissive charge transfer (CT) excitons formed at the heterojunction are prone to direct field-induced dissociation. However, the split-up of these CT excitons cannot fully account for the photocurrents observed on the very same devices. It is proposed that the formation of free carriers involves a nonemissive precursor and that the recombination of this precursor does not proceed via the formation of CT excitons.

AB - A bulk heterojunction system consisting of a soluble poly(p- phenylenevinylene) donor and a small molecular electron acceptor based on Vinazene (2-vinyl-4,5-dicyanoimidazole) has been investigated with respect to the correlation between field-induced emission quenching and free charge carrier formation. Transient and steady-state emission properties measured at different voltages indicate that emissive charge transfer (CT) excitons formed at the heterojunction are prone to direct field-induced dissociation. However, the split-up of these CT excitons cannot fully account for the photocurrents observed on the very same devices. It is proposed that the formation of free carriers involves a nonemissive precursor and that the recombination of this precursor does not proceed via the formation of CT excitons.

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The relationship between the electric field-induced dissociation of charge transfer excitons and the photocurrent in small molecular/polymeric solar cells

Abstract

Keywords

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