Abstract
The high fill factor (FF) and high power conversion efficiency (PCE) of organic solar cells (OSCs) were investigated using an inorganic/organic stacked hole-transporting layer (HTL) of vanadium oxide (V2O5)/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) between indium–tin oxide (ITO) and an active layer. The OSC configuration comprises ITO/V2O5/PEDOT:PSS/poly(3-hexylthiophene):phenyl C61-butyric acid methylester (P3HT:PCBM)/LiF/Al. The FF and PCE are 44 and 2.67% under simulated AM1.5G illumination of 100 mW/cm2, which are approximately double and tenfold, respectively, greater than those of a conventional device without the buffer layer. The V2O5/PEDOT:PSS stacked HTL provides a smooth film surface for coating the P3HT:PCBM active layer, in addition to its stepwise hole-transporting configuration, subsequently increasing charge carrier transporting capability and extracting holes from the active layer.
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