Over the last few years, organic electronics have become a keyword for new types of applications based on organic semiconductors and other materials that can easily be processed. Typical for this new class of materials are low temperature processes and large area deposition and structuring with various coating and printing processes. The active semiconductor materials determine the performance of the entire system considerably. That is why a simple and reliable electronic characterization of these semiconductors is not only an essential prerequisite for material development in the labs of organic chemists but also for process developers and circuit designers.
For material analysis in the field of organic semiconductors, the Fraunhofer IPMS provides standardized single transistor structures in bottom gate architecture. These substrates for organic field effect transistors (OFETs) are produced in the clean room on silicon wafers with thermal silicon dioxide (SiO2) as full-area dielectrics and gold electrodes in lift-off technology. This is a significant advantage with respect to reliability and reproducibility that enables the application of these substrates for quality assurance in major chemical corporations.
The spectrum of possible customers is very large and ranges from universities, independent research institutions to industrial customers. The OFET substrates that are manufactured are used for research purposes in the field of materials testing or for quality control, respectively. They are essential for organic materials development. To date, the customer base of Fraunhofer IPMS in this sector has grown to 100 customers worldwide, including 15 key customers and two market-listed companies, both national and international.
The Fraunhofer IPMS offers different standard solutions and realizes customer-specific modifications by tailoring the samples with respect to chip size, design, and layer thickness of the thermal oxide. In order to simplify the measurement procedures of OFET substrates, the Fraunhofer IPMS has also developed a hand prober. This OFET miniprober allows faster and easier measurements by reliable pad contacting.