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

We demonstrated semitransparent inverted polymer olar 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/cm(2) from the WO3/Ag/MoO3 side.