Common and inverted heterojunction small-molecule organic solar cells

The common and inverted heterojunction small-molecule organic solar cells with MoO3 as anode modification layer, Rubrene/C60 as active layer were prepared. The experimental results reveal that the inverted devices have better performance compared with the common ones, and the open circuit voltage(Voc), short circuit current density (Jsc), fill factor(FF) and power conversion efficiency (η) increased 34%, 20%, 25%, 102%, respectively. Inserting BCP cathode buffer layer which preventing C60 from the damage by hot Al atoms deposition does not affect the performances of the inverted devices, but markedly improves those of common ones. The influence of MoO3 and BCP on the device performances is analyzed.