  The influences of work function of transparent conducting oxides (TCO) on the
per-formance of organic solar cells, including open circuit voltage, conversion
efficiency and fill factor, has been simulated. It is obtained that for
non-Ohmic contact the open circuit voltage and conversion efficiency increase
monotonically with the TCO work function but keep constant for Ohmic contact.
Fill factor decreases and increases with the electrode work function when the
electrode work function is below and above a critical value (4.2 eV for TCO and
4.5 eV for back-contact), respectively. The results of this simulation are
significant in the choice of TCO contacts to optimize organic planar
heterojunction solar cells.
