Inverted type bulk-heterojunction organic solar cell using electrodeposited titanium oxide thin films as electron collector electrode

We developed an inverted type bulk-heterojunction organic solar cell with 1 cm2 active area using a fluorine-doped tin oxide/electrodeposited amorphous (TiOx) or anatase (TiO2) titanium oxide electrode instead of the low work-functional electrode such as Al. The cell with TiO2 showed the power conversion efficiency (η) of 2.5% by irradiating AM 1.5–100 mW cm− 2 simulated sunlight. While, the performance of the cell with TiOx was almost maintained in an ambient atmosphere under continuous light irradiation of 10 h, although slightly small initial η value of 2.1% was observed.