Physical and Analytical Chemistry Seminar
Lecturer: Adam K. Budniak
Location: Faculty Seminar Room
The aspect of printed electronics is an emerging scientific area, which is expected to change the production of electronic devices. The biggest advantages of printed devices are that they can be fabricated on flexible, transparent substrates and over large areas at much lower temperatures and with smaller cost. Layered materials (also called 2D materials or van der Walls crystals) belong to a large family of anisotropic compounds which have strong, covalent bonds within a layer while between layers there are only weak van der Waals interactions that can be overcome, obtaining molecularly thin sheets. From the moment of graphite exfoliation into an atomically thin monolayer, known today as graphene, two dimensional materials have been of main interest for a variety of electronic applications. For example, these materials can be exfoliated via sonication in liquids, and what is important for this method, it is relatively easy to convert the received suspension of few-layer flakes into an “ink” – stable suspension with demanded rheological properties, that can be used in ink-jet-printing of electronic devices. Recently, different liquid exfoliated van der Waals crystals were used to build all-printed transistors or photodetectors. Probably, the biggest advantage of this approach is relatively straightforward building of heterostructures, as layers of different materials can be deposited on each other, so this way ink-jet-printing can lower device preparation cost, by accelerating production and omitting expensive methods – lithography or time demanding like dry transfer.
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