Low-temperature, Aqueous Solution-Processed V2O5 As the Hole-Transport Layer for High Performance Organic Solar Cells

Organic solar cells were fabricated with solution-processed V 2 O 5 as anode buffer layers, we report a novel interface engineered of V 2 O 5 with efficient charge transport in the devices. Solution-processed V 2 O 5 thin films have been easily obtained by dissolving the V 2 O 5 powder directly into water in air. V 2 O 5 film present good contact between the interface of ITO and active layer. Furthermore, the optical field intensity | E | 2 for the device with V 2 O 5 layer is enhanced in active layer compared to PEDOT:PSS based device, which result in improved J sc . The V 2 O 5 device exhibits 8.05% high power conversion efficiency, conventional PEDOT:PSS device obtained only 7.46% efficiency.