Undoping effect of electropolymerized polymer for two‐layer organic photovoltaic ceils based on polymer/dye junction

摘要

AbstractThe undoping effects of electropolymerized poly(3‐methylthiophene) (PMeT) and poly(N‐methylpyrrole) (PMPy) on the open‐circuit photovoltageVocand on short‐circuit pho‐tocurrentJscwere investigated for two‐layer organic photovoltaic cells based on the PMeT or PMPy / vacuumevaporated rhodamine B (RB) under the electrochemical doping level between −3 and +3 V. The value ofVocof the undoped‐polymer / RB cell was larger than that of the doped‐polymer / RB cell. PMeT/RB and PMPy/RB cells gave the minimum value ofJscat a doping level of 0 V. It was suggested that polarons and bipolarons states formed at a doping level of 0 V may work as a trap site for the carrier to decrease inJsc. Undoping of the PMeT improvedVocandJscof the PMeT/RB two‐layer organic pho‐tovoltaic cell together with its durability. © 199