Role of CsF on electron injection into a conjugated polymer

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Abstract
We studied electron injection from Al and Au cathodes into the conjugated polymer poly[2-methoxy,5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH–PPV). When a thin CsF layer is inserted between MEH–PPV and Al, a substantial enhancement in electron injection is observed. Insertion of the same layer between MEH–PPV and Au does not have a similar effect, indicating that the enhancement mechanism is specific to CsF and Al. Thin Cs layers enhance electron injection regardless of the cathode metal. A mechanism that explains these observations is proposed.