Separating electrons and holes: A prerequisite for photovoltaic
applications
Blending C60 and
p-conjugated polymer
Nearly 100%
electron transfer to the C60
Because of
bipolaron BP2+ formation minimal back transfer
Polymer has
good hole mobilities
Design of
interface and electron transport are bottle
necks
Recombination of P+ and P- reduces device efficiency
From: Christoph J. Brabec, N. Serdar
Sariciftci, and Jan C. Hummelen, Advanced Functional Materials 11 (2001).