Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance

J. Behrends; A. Schnegg; K. Lips; Elizabeth Alice Thomsen; Ajay K Pandey; Ifor David William Samuel; D. J. Keeble

doi:10.1103/PhysRevLett.105.176601

Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance

J. Behrends, A. Schnegg, K. Lips, Elizabeth Alice Thomsen, Ajay K Pandey, Ifor David William Samuel, D. J. Keeble

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

Abstract

We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a pi-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage (1 V) used, suppresses negative polaron formation in the polymer. It is concluded that spin-dependent transport is due to the formation of positive bipolarons.

Original language	English
Article number	176601
Number of pages	4
Journal	Physical Review Letters
Volume	105
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.105.176601
Publication status	Published - 19 Oct 2010

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10.1103/PhysRevLett.105.176601

EPSRC AOOMD Fellowship: Advanced Organic Optoelectronic Materials and Devices
Samuel, I. D. W. (PI)
EPSRC
1/03/06 → 28/02/11
Project: Fellowship

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title = "Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance",

abstract = "We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a pi-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage (1 V) used, suppresses negative polaron formation in the polymer. It is concluded that spin-dependent transport is due to the formation of positive bipolarons.",

author = "J. Behrends and A. Schnegg and K. Lips and Thomsen, {Elizabeth Alice} and Pandey, {Ajay K} and Samuel, {Ifor David William} and Keeble, {D. J.}",

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doi = "10.1103/PhysRevLett.105.176601",

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T1 - Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance

AU - Behrends, J.

AU - Schnegg, A.

AU - Lips, K.

AU - Thomsen, Elizabeth Alice

AU - Pandey, Ajay K

AU - Samuel, Ifor David William

AU - Keeble, D. J.

PY - 2010/10/19

Y1 - 2010/10/19

N2 - We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a pi-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage (1 V) used, suppresses negative polaron formation in the polymer. It is concluded that spin-dependent transport is due to the formation of positive bipolarons.

AB - We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a pi-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage (1 V) used, suppresses negative polaron formation in the polymer. It is concluded that spin-dependent transport is due to the formation of positive bipolarons.

U2 - 10.1103/PhysRevLett.105.176601

DO - 10.1103/PhysRevLett.105.176601

M3 - Article

SN - 0031-9007

VL - 105

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

M1 - 176601

ER -

Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance

Abstract

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EPSRC AOOMD Fellowship: Advanced Organic Optoelectronic Materials and Devices

Cite this