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Ultrafast Terahertz Photoconductivity of Bulk Heterojunction Materials Reveals High Carrier Mobility up to Nanosecond Time Scale

C. S. Ponseca ; A. Yartsev ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; D. Vithanage ; V. Sundstrom
Journal of the American Chemical Society (0002-7863). Vol. 134 (2012), 29, p. 11836-11839.
[Artikel, refereegranskad vetenskaplig]

The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer fullerene blends (at excitation fluencies similar to 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 (similar to 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.

Nyckelord: alternating polyfluorene copolymer, geminate charge recombination, polymer solar-cells, spectroscopy, dynamics, blends, photogeneration



Denna post skapades 2012-09-11. Senast ändrad 2014-09-02.
CPL Pubid: 163156

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur