Efficient Semitransparent Inverted Polymer Solar Cells With the Anode of Tunable Incident Light Transmittance

We demonstrated semitransparent inverted polymer solar cells by employing a transparent WO₃/Ag/MoO₃ anode, which exhibited high transmittance in the visible region. The inner WO₃ layer was introduced as a buffer layer to improve the hole collection, while the outer MoO₃ layer served as a light coupling layer to enhance the optical transmittance of the device. The dependence of the device performances on the thickness of the outer MoO₃ layer was investigated, and the transmittance and reflectance of the WO₃ (10 nm)/Ag (13 nm)/MoO₃ (0, 20, 40, 60, and 80 nm) electrode were compared. The results show that a high transmission of 80% with a high power conversion efficiency of 1.24% was achieved when the thickness of the MoO₃ layer was 40 nm under AM1.5G illumination of 100 mW/cm² from the WO₃/Ag/MoO₃ side.