Solution-processed inverted organic solar cell using V2O5 hole transport layer and vacuum free EGaIn anode

Abstract In this study, the sol–gel V 2 O 5 derived by a hydrothermal method to replace the PEDOT:PSS which is a hole transport layer between organic active layer and two different anodes in inverted organic solar cells with TiO 2 as an electron transport layer was investigated. The power conversion efficiencies of inverted organic photovoltaic cells increased approximately twofold with using V 2 O 5 instead of PEDOT:PSS on top of the photoactive layer. It was demonstrated that the power conversion efficiencies of inverted organic solar cells prepared with V 2 O 5 solution which was diluted with isopropanol in certain proportions by volume were decreased by increasing ratio of isopropanol in total volume. It was reported for the first time that the inverted organic photovoltaic cells prepared using V 2 O 5 interlayer and Eutectic Gallium–Indium alloy which was prepared using vacuum free simple brush-painted method and can be used as anode electrode as Ag electrode.

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