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 | |
Publication status | Published - 25 Jul 2012 |