Figure 2.

PS/FTO J-V characteristics. Current-voltage characteristics of PS/FTO heterojunctions. Dark and illuminated condition curves are shown. The dark condition characteristic of this heterojunctions presents a rectifying behavior in reverse bias, similar to that of a conventional diode. When illuminated at 110 mW/cm², PS/FTO generates a photovoltaic effect with an the open-circuit voltage value of 70 mV and short-circuit current of 5 mA/cm⁻². A fit with a simple diode model is also included.