With the laboratory scale tests now complete, in-line implementation is now to be developed at VTT’s electrical measurement line (see the TESLA Line in figure 3).
The TESLA Line has 400 test pins that are traditionally used to measure the I-V characteristics of each line in stop-and-go mode. These pins can be configured to apply the voltage necessary for DLIT, with stop-and-go operation being the ideal mode since the voltage is usually applied as square waveforms for a short period of time (less than 5 seconds), which offers the optimum results from DLIT. Lock-in thermography enables the TESLA line to have the capability to find problem zones within the sample.
Upon successful completion, in-line DLIT would enable the detection of problem zones (hot spots) and also provide a measure of the quality of the printed lines.
Work on the in-line implementation has now initiated following the successful completion of the lab scale tests and algorithm development work. The software development required for the in-line testing is now nearing completion. This in-house developed software comprises data acquisition, data visualisation, and lock-in post processing and data analysis capabilities integrated to a single package. The screenshots of the user interface when performing various functions are shown in Figure 4. Other aspects of the work that are currently being finalised include the set-up of the system on the TESLA Line (see Figure 5) where the potential location of the camera has been identified – below the test area where there is free space.
It is expected that the work will be completed by the end of January 2021.
Alongside TWI, the OLEDSOLAR Project partners include Teknologian tutkimuskeskus VTT Oy (VTT), Fraunhofer Gesellschaft (FhG), Nederlandse Organisatie voor Toegepast Narrturwetenschappelijk Onderzoek (TNO), INNOVACIO I RECERCA INDUSTRIAL I SOSTENIBLE SL (IRIS), ARMOR solar power films GmbH), Centre Suisse D’Electronique Et De Microtechnique SA (CSEM), Solibro Hi-Tech GmbH (Solibro), Smit TS & Smit Thermal Solutions, Brunel University London (BUL), Acondicionamiento Tarrasense Associacion (LEITAT), Coatema Coating Machinery GmbH (Coatema), DuPont Teijin Films UK Ltd (DTF), Silicon Austria Labs GmbH (SAL), ADVANCED ENERGY TECHNOLOGIES S.A. (Advent), and INURU GmbH. (INURU).
This OLEDSOLAR project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 820789