How are the #microelectronic #bioelectronic chips produced?🤔
The production starts from the blank silicon wafers. Layering follows, where insulating and conductive materials are deposited onto the wafer. The #wafer is then covered with photoresist, and UV light is shone through a photomask to pattern the circuit of the sensor. Next comes the etching process, using chemicals or plasma to remove areas without photoresist. Doping is applied afterwards to alter the electrical properties of the silicon.
These steps are repeated in cycles to build the complex interconnected structure of the chip. Subsequently, layers of metal are deposited to establish connections between the circuit elements. Once completed, the wafers are tested for defects and then packaged 🤯 .
For a demonstration of this process, check out the video from #ihpmicroelectronics (https://www.ihp-microelectronics.com/news-2/mediathek/videos). In the previous post, we showed how the #silicon chip originated from this wafer.
The picture shows a full wafer glued to blue tape for chip separation by sawing, from which some #biosensor chips have already been taken.
