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Simplify OLED microdisplay production via orthogonality

Posted: 06 Jun 2014     Print Version  Bookmark and Share

Keywords:OLED  microdisplays  organic electronics  OTFT  orthogonality 

The organic electronics industry still lacks a unified and low-cost structuring method despite numerous applications ranging from organic light emitting diodes (OLEDs) to organic solar cells or even organic thin film transistors (OTFT), Dr. Alexander Zakhidov of Fraunhofer Institute's COMEDD emphasised during his presentation at SID Display Week.

Orthogonal photolithography, he promises, is the key to easier device engineering with better materials compatibility and higher manufacture yields with feature resolutions down to 1µm.

The organic materials orthogonality concept is about developing photolithography-compatible non-polar and polar materials that can be processed with non-polar organic solvents, environment friendly fluorous solvents such as Hydrofluoroethers, and hydroxylic solvents.

RGB OLED passive matrix display working prototype

Figure 1: RGB OLED passive matrix display working prototype.

By developing a so-called organic-compatible orthogonal resist, the researcher has proven a number of structuring processes such as photoresist deposition and development after selective UV exposure, pattern transfer through etching, or active material deposition over patterns before lift-off.

All this was done using conventional photolithographic equipment typically used with inorganic semiconductor chemistries. Even depreciated equipment could ensure fast automated processes with resolutions under 100nm and yields over 95 per cent.

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