Disk-shaped molecules can be self-assembled into columns, which may exhibit one-dimensional charge transporting
properties within well-oriented domains. They are promising materials to choose in fabrication of organic photovoltaic
device and to improve photovoltaic responses. In this work, a discotic triphenylene derivative
2,3,6,7,10,11-hexapentyloxytriphenylene (HAT5) was investigated and used in fabrication of organic photovoltaic
devices. The device have a double-layered structure of ITO/HAT5/PTCDI-C<sub>13</sub>/Al, in which HAT5 acts as an acceptor
and hole transporting layer and <i>N,N'</i>-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C<sub>13</sub>) acts as a donor
and electron transporting layer. The device demonstrated an open circuit voltage up to 0.7V, which depended strongly on
the thickness of the PTCDI-C<sub>13</sub> layer. Function of organic/organic interface to the generation of photovoltaic effect was
observed experimentally through a comparison of device made with HAT5 layers of different molecular arrangement. A
higher ordered morphology obtained through annealing led to a substantial improvement in the fill factor of the device.
A distinct change in open circuit voltage was also observed upon the molecular orientation though it was not what we
anticipated. This work demonstrated a useful route to tune the performance of photovoltaic response of organic devices
through manipulating molecular orientation and organization in the device.