Role of CsF on electron injection into a conjugated polymer
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 2000
- DOI:
- 10.1063/1.1317547
- Bibcode:
- 2000ApPhL..77.2403P
- Keywords:
-
- 85.60.Jb;
- 73.40.Ns;
- Light-emitting devices;
- Metal-nonmetal contacts