  Eutectic NiTiO$_3$-TiO$_2$ samples and their H$_2$ reduced Ni-TiO$_2$
samples, where high aspect ratio TiO$_2$ nanostructures are axially decorated
with nodular Ni globules, are thoroughly explored to understand their effect in
photo-response. We show that by employing this novel eutectic architecture,
effectively exploiting the nano-structuring process along with the chosen
material properties, the overall efficiency of the ensuing photoactive device
is improved. We also show the competing photo-driven and photothermal-driven
carrier mechanisms to define the total photo-response of the system.
Additionally, the ability to function self-powered poses this approach as a
potential strategy for achieving efficient photodetectors.
