The Cu2O has been widely investigated because its
abundance, easy fabrication capability, bandgap tuning capability,
and p-type conduction. In addition, the electrical conductivity, Hall
mobility, and optical absorption (104 cm1) for visible light of
these materials are higher than other oxide semiconductors that
can be synthesized in the same temperature regime. The
theoretical efficiencies of Cu2O based solar cells are estimated to
be in the range of 20% under AM1 illumination [11]. Therefore, the
present investigation may find some potential applications in
practical devices, such as solar cells.