Nanostructured materials and photovoltaic devices including nanostructured
materials are described. In one embodiment, a nanostructured material
includes: (a) a first nano-network formed from a first set of
nanoparticles; and (b) a second nano-network coupled to the first
nano-network and formed from a second set of nanoparticles. At least one
of the first set of nanoparticles and the second set of nanoparticles are
formed from an indirect bandgap material. The nanostructured material is
configured to absorb light to produce a first type of charge carrier that
is transported in the first nano-network and a second type of charge
carrier that is transported in the second nano-network. The
nanostructured material has an absorption coefficient that is at least
10.sup.3 cm.sup.-1 within a range of wavelengths from about 400 nm to
about 700 nm.