Semitransparent polymer solar cells using V2O5/Ag/V2O5 as transparent anodes

We demonstrate semi-transparent inverted polymer solar cells with transparent anodes, made of Vanadium pentoxide (V2O5)/silver (Ag)/V2O5. The inner V2O5 layer was introduced as a buffer layer to improve holes collection, while the outer V2O5 layer served as a light coupling layer to enhance optical transmittance of the device. The transmittance and reflectance of V2O5 (10 nm)/Ag (13 nm)/V2O5 (x = 20, 40, 60, 80 nm) electrode are measured and compared, and the dependence of the device performances on the thickness of the outer V2O5 layer was investigated. The results show that the maximum transmittance of 90%, which appears from 400 to 700 nm, is obtained when the thickness of outer V2O5 layer is 40 nm.

The photovoltaic device has a structure of ITO/nc-TiO2/RR-P3HT: PCBM/V2O5/Ag/V2O5, and the influence of outer V2O5 on device performance are investigated in detail.Figure optionsDownload as PowerPoint slideHighlights
► The inner V2O5 was introduced as a buffer layer to improve holes collection.
► The outer V2O5 layer served as a light coupling layer to enhance optical transmittance.
► A high transmission of 90% was achieved with a 40 nm outer V2O5 layer.
► The reflectance peaks are red shifted gradually when the thickness of the outer V2O5 increases.