  A solar cell design using the combination of titanium dioxide and graphite as
active photon absorbing materials were proposed. The titanium dioxide absorbs
photons of nearly ultraviolet wavelengths to produce electron hole pairs, while
graphite is expected to absorb photons of longer wavelengths. Although many
authors have claimed that graphite is not a semiconductor, we observed that a
model of a solar cell containing titanium dioxide only as the active material
behaves exactly the same as a model containing graphite only as the active
material. Additionally, we observed that a model of a solar cell made using a
composite of titanium dioxide and graphite as the active material had much
higher efficiency than solar cells made using titanium dioxide only or graphite
only active materials.
