Photocurrent generation in polymer-fullerene bulk heterojunctions.
The photocurrent in conjugated polymer-fullerene blends is dominated by the dissociation efficiency of bound electron-hole pairs at the donor-acceptor interface. A model based on Onsager's theory of geminate charge recombination explains the observed field and temperature dependence of the photocurrent in PPV:PCBM blends. At room temperature only 60% of the generated bound electron-hole pairs are dissociated and contribute to the short-circuit current, which is a major loss mechanism in photovoltaic devices based on this material system.
Mihailetchi
V D
VD
Molecular Electronics, Materials Science CentrePlus, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.
Koster
L J A
LJ
Hummelen
J C
JC
Blom
P W M
PW