No more error-prone evaporation deposition, drop casting or printing: Scientists at LMU Munich and FSU Jena have developed organic semiconductor nanosheets, which can easily be removed from a growth substrate and placed on other substrates.
Today’s computer processors are composed of billions of transistors. These electronic components normally consist of semiconductor material, insulator, substrate, and electrode. A dream of many scientists is to have each of these elements available as transferable sheets, which would allow them to design new electronic devices simply by stacking.
This has now become a reality for the organic semiconductor material pentacene: Dr. Bert Nickel, a physicist at LMU Munich, and Professor Andrey Turchanin (Friedrich Schiller University Jena), together with their teams, have, for the first time, managed to create mechanically stable pentacene nanosheets.
The researchers describe their method in the journal Advanced Materials. They first cover a small silicon wafer with a thin layer of a water-soluble organic film and deposit pentacene molecules upon it until a layer roughly 50 nanometers thick has formed. The next step is crucial: by irradiation with low-energy electrons, the topmost three to four levels of pentacene molecular layers are crosslinked, forming a “skin” that is only about five nanometers thick. This crosslinked layer stabilizes the entire pentacene film so well that it can be removed as a sheet from a silicon wafer in water and transferred to another surface using ordinary tweezers.
Apart from the ability to transfer them, the new semiconductor nanosheets have other advantages. The new method does not require any potentially interfering solvents, for example. In addition, after deposition, the nanosheet sticks firmly to the electrical contacts by van der Waals forces, resulting in a low contact resistance of the final electronic devices. Last but not least, organic semiconductor nanosheets can now be deposited onto significantly more technologically relevant substrates than hitherto.
Of particular interest is the extremely high mechanical stability of the newly developed pentacene nanosheets, which enables them to be applied as free-standing nanomembranes to perforated substrates with dimensions of tens of micrometers. That is equivalent to spanning a 25-meter pool with plastic wrap. “These virtually freely suspended semiconductors have great potential,” explains Nickel. “They can be accessed from two sides and could be connected through an electrolyte, which would make them ideal as biosensors, for example”. “Another promising application is their implementation in flexible electronics for manufacturing of devices for vital data acquisition or production of displays and solar cells,” Turchanin says.
Learn more:Semiconductors as decal stickers
The Latest on: Organic semiconductor nanosheets
- Innovations in Thermal Interface Materials Analyzed by IDTechExon March 4, 2021 at 7:45 am
IDTechEx has carried out leading market research on the topic of thermal interface materials. Detailed analysis is provided on both the materials and a wide range of applications. The innovations ...
- Promises and prospects of two-dimensional transistorson March 3, 2021 at 9:13 am
Two-dimensional (2D) semiconductors have attracted tremendous interest as atomically thin channels that could facilitate continued transistor scaling. However, despite many proof-of-concept ...
- Facile synthesis of nickel cobaltite quasi-hexagonal nanosheets for multilevel resistive switching and synaptic learning applicationson February 25, 2021 at 6:35 pm
electrode (thickness: ~100 nm and diameter ~200 μm). Fig. 1: Morphological and compositional characterizations of the quasi-hexagonal NCO nanosheets.
- Tapping into waste heat for electricity by nanostructuring thermoelectric materialson February 16, 2021 at 2:17 pm
"The unconventional method we employed to obtain porous SnTe nanosheets could be relevant for other thermoelectric semiconductors, as well as in the fabrication and research of porous and ...
- Tapping into waste heat for electricity by nanostructuring thermoelectric materialson February 16, 2021 at 7:17 am
Equally important, however, is the insight gained by exploring a new synthesis strategy, as Kim explains: "The unconventional method we employed to obtain porous SnTe nanosheets could be relevant for ...
via Google News and Bing News