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The authors report on enhanced efficiency of polymer light-emitting electrochemical cells (LECs) by means of forming a n-doping self-assembled monolayer (SAM) at the cathode-polymer interface. The addition of the SAM, a silane-based salt with structural similarity to the commonly used LEC n-dopant tetra-n-butylammonium, caused a twofold increase in quantum efficiency. Photovoltaic analysis indicates that the SAM increases both the open-circuit voltage and short-circuit current. Current versus voltage data are presented which indicate that the SAM does not simply introduce an interfacial dipole layer, but rather provides a fixed doping region, and thus a more stable p-i-n structure

Fixed p-i-n junction polymer light-emitting electrochemical cells based on charged self-assembled monolayers