Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scale.

Carlito Ponseca Jr; Arkady Yartsev; Ergang Wang; Mats R. Andersson; Dimali Vithanage; Villy Sundstrom

doi:10.1021/ja301757y

Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scale.

Carlito Ponseca Jr, Arkady Yartsev, Ergang Wang, Mats R. Andersson, Dimali Vithanage, Villy Sundstrom

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

57 Citations (Scopus)

Abstract

The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer:fullerene blends (at excitation fluencies ∼10 ¹⁵ photons/cm ² per pulse) is shown to be a result of charge pair annihilation for two polymer:PCBM blends. At a factor of 100 lower excitation density, the THz decay is in the hundreds of ps time scale, implying that very high carrier mobility (∼0.1 cm ² V ^-1 s ^-1) prevails for long time after charge formation, of importance for free charge formation in organic solar cells.

Original language	English
Pages (from-to)	11836-11839
Number of pages	4
Journal	Journal of The American Chemical Society
Volume	134
Issue number	29
DOIs	https://doi.org/10.1021/ja301757y
Publication status	Published - 25 Jul 2012

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title = "Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scale.",

abstract = "The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer:fullerene blends (at excitation fluencies ∼10 15 photons/cm 2 per pulse) is shown to be a result of charge pair annihilation for two polymer:PCBM blends. At a factor of 100 lower excitation density, the THz decay is in the hundreds of ps time scale, implying that very high carrier mobility (∼0.1 cm 2 V -1 s -1) prevails for long time after charge formation, of importance for free charge formation in organic solar cells.",

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Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scale. / Ponseca Jr, Carlito; Yartsev, Arkady; Wang, Ergang; Andersson, Mats R.; Vithanage, Dimali; Sundstrom, Villy.

In: Journal of The American Chemical Society, Vol. 134, No. 29, 25.07.2012, p. 11836-11839.

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

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AU - Ponseca Jr, Carlito

AU - Yartsev, Arkady

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AU - Andersson, Mats R.

AU - Vithanage, Dimali

AU - Sundstrom, Villy

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JF - Journal of The American Chemical Society

SN - 0002-7863

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Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scale.

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