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Sections PDFPDF Tools Share Abstract Ultrathin polyethylenimine (PEI) interlayers are frequently used to reduce the work function of electrode materials; however, to exploit the full potential of this material for application in optoelectronic devices, further fundamental understanding is required. Here, it is demonstrated that intermixing of PEI deposited from water solution onto the conductive polymer poly(3,4‐ethylene‐dioxythiophene) (PEDOT):polystyrene sulfonate can be avoided by usingdoi:10.18452/21467 fatcat:itprlsqhzfd2lebmts5cmocu7u