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Laser processing of printed electronic layers

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All right, perfect. The stage is yours. Thank you. So had everyone as already told. My name is Jonas Martin from Fraunhofer Ilt in Germany. And I'm going to present you some of the work related to printed electronics now.

So as a first small hint, what are we doing? Who are we? I'm coming from the group fields of film, film processing, a form of ilt, and we're covering in detail five different topics, all about things and processing. So the first one is about cleaning, painting, pretreatment of layers or substrates. The second one is about corrosion, corrosion resistance and anti stick layers. The third one is about energy and mobility means a particular battery technology and hydrogen technology.

And the two topics I'm going to detail today are printed electronics and embedded sensors and microelectronics in particular, also by printing technology. So our approach to what's printed electronics, we are using laser radiation sources for the additive production of electronic layers. Depending on this, we typically have about four process steps, not too different from those you already know from printed electronics. So firstly, we usually do a surface pre-treatment mainly via laser radiation, but we do also use sometimes more conventional techniques like plasma treatment and so on. Secondly, we do the position of the layers, mainly with lasers, also by industrial technologies, mainly like inkjet printing, also jet printing, screen printing and so on. And then we add the point where our main expertise comes in, which is the thermal treatment of the layers, meaning on one hand, laser base drying, getting all the organic components out of the layer. And on the other hand, laser based functionalization meaning in particular the sintering and the melting of the particulate layers.

If you need multi material or multi layers, we can do this, of course, in the loop and the benefits we try to create are massive, as you see.

But I think in this context the main is the main benefits come from a resource efficient, flexible, low cost application of of sensors and layers onto 3D components and the application of our technology only on a selective area of the substrate. So first example I want to show you about how about the technology is from the field of microelectronics. Here we are printing actors or micro actors onto silicon wafers, which then can be used to produce micro speakers, hearing aids and so on. So therefore, we use inkjet printing to deposit multiple layers of lithium nickel oxide and lead tonight onto platinum silicon or two platinum coated silicon wafers. And the printheads are laser crystallized by using laser radiation. So as you can see this here, so that we can get multiple layers with this, we get multiple, very homogeneous layers of those two components which we can cure using laser radiation in shorter times, which in comparison, which one would need if he's using an oven or an eight and those layers later get an etched and contacted to produce these loudspeakers I was telling you about

a second application comes from aerospace and this is about the integration of functions into fiber reinforced plastics by the combination of printing and laser technology. And in particular, we are here about here we are here talking about the integration of function into semi-finished products, which means we have some kind of textile which we are printing on and which is then fabric worked on by vacuum infusion, for example, to produce different features into the final component like deformation sensors, integrated LEDs or humidity sensors, which we demonstrated together with our colleagues from Fraunhofer, F.M. and Wing Leading Edge to show these integrated functions.

Next application is about the combination of 3D printing with printed electronics. So what we are trying here to do is printing of strain gauges onto 3D printed components. We do this by the position of insulation layers by dispensing process. After that, we use each technology to print strain gauges onto the component and then using laser sintering to have the possibility to only sintered strain gauge without touching from a heat point of view, the component itself and equipped with a wireless transmission board, we are able to do wireless integrated structural health monitoring onto components, which is almost all printed except for the for the transmission board right now. We also did some function tests with similar structure where we can see that as the wireless transmission as well as the signal generation by the strain gauge is working quite well to get signal and to measure the strain. But it's not only about on the component, but also going into into a component. So what we did here is having a laser powered fusion process, metal 3D printing process, which we stopped at one point and then went on with integrating sensors. Again, here we are talking about string gauges into this component by printing and laser sintering, this time with aerosol object printing technology. And then after wiring and encapsulation of the sensors, we finished the 3D printing process, we reworked the component and then had a finally working milling hat with integrated sensors, which you can use for machining your metals while measuring all the mechanical properties inside your head. So with this, I'm going to end my presentation. Thanks a lot for your attention. If you have any questions, I would happily answer them. Just contact me with the contact data you see there. And thank you.


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