Inverted Polymer Solar Cell using 'Ta' doped V2O5 Thin Film as Cathodic Buffer Layer.

'Ta' 8 wt % doped V₂O₅ thin film was deposited onto ITO substrate by thermal evaporation method. The XRD pattern confirms the film to be polycrystalline with orthorhombic structure. The SEM image show a smooth spongy bush like structure. Transparency of 'Ta' 8 wt % doped V₂O₅ film is around 35% in visible region and it decreased in IR region. Transport properties were studied by Hall effect measurements. Inverted polymer solar cell using 'Ta' 8 wt % doped V₂O₅ thin film as cathodic buffer layer with device structure ITO/'Ta' 8 wt % V₂O₅/P3HT:PCBM/MoO3/Ag has been fabricated and studied. [ABSTRACT FROM AUTHOR]