Ultrafast Terahertz Photoconductivity of Bulk Heterojunction Materials Reveals High Carrier Mobility up to Nanosecond Time Scale
Artikel i vetenskaplig tidskrift, 2012

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.

blends

dynamics

photogeneration

alternating polyfluorene copolymer

polymer solar-cells

geminate charge recombination

spectroscopy

Författare

C. S. Ponseca

Lunds universitet

A. Yartsev

Lunds universitet

Ergang Wang

Chalmers, Kemi- och bioteknik, Polymerteknologi

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

D. Vithanage

Lunds universitet

V. Sundstrom

Lunds universitet

Journal of the American Chemical Society

0002-7863 (ISSN) 1520-5126 (eISSN)

Vol. 134 11836-11839

Ämneskategorier

Kemi

DOI

10.1021/ja301757y