Abstract

8-hydroxyquinolinato lithium (Liq) nano-interlayer was evaluated as part of the interconnection layer (ICL) system Liq|Al|MoO3 to produce tandem organic photovoltaic (OPV) devices. First, the thickness dependence of Liq on the performance of single-stack OPV devices was studied, along with its stability by exposing the devices to different degradation conditions. The results confirmed the benefits of incorporating Liq, providing even further stability, particularly to devices exposed to air. Then, symmetrical tandem OPV devices were prepared by optimizing the thickness of the Al interlayer to obtain an efficient ICL. Although limited power conversion efficiencies were obtained due to the symmetry of the device architecture, electrical, optical, and lifetime measurements confirmed Liq|Al|MoO3 as a suitable ICL to achieve tandem OPV devices.