Figure 2
Current-voltage characteristics of ITO/TiO 2 /MEH-PPV/Au device. The solid line (J D) was recorded in the dark, and the dot line (J L) was measured under illumination at 470 nm with an intensity of 158.5 W/m2. The thickness of TiO2 layer was d = 65 nm, while that of the polymer layer was l = 220 nm. The inset shows the J ph as a function of bias, where the arrow indicates the compensation voltage (V 0).