  In this paper we report photovoltaic devices fabricated from PbS nanocrystals
and the conducting polymer poly MEH-PPV. This composite material was produced
via a new single-pot synthesis which solves many of the issues associated with
existing methods. Our devices have white light power conversion efficiencies
under AM1.5 illumination of 0.7% and single wavelength conversion efficiencies
of 1.1%. Additionally, they exhibit remarkably good ideality factors (n=1.15).
Our measurements show that these composites have significant potential as soft
optoelectronic materials.
