CMOS-compatible organic light-emitting diodes

We report a new interesting method for the integration of light-emitting devices on silicon substrate. As an active layer, we use unsubstituted PPV or PPV-based organic macromolecules with a p(+)-silicon anode and a cathode made from aluminum or titanium. The polymer is deposited by spin-coating the precursor, followed by a thermal conversion step to form the macromolecules. All process steps, including the possibility of dry etching of the active layer and the upper electrode, are typical for MOS technology. Spectrum analysis, current-voltage, and intensity measurements have been carried out for device characterization. These organic light-emitting diodes (OLED's) allow the monolithic integration of microelectronic circuits and light-emitting devices on one silicon chip applying only MOS typical process steps.