Programmed assembly of wafer-scale atomically thin crystals —

Lego blocks, beloved by each kids and adults, may be assembled into set fashions like area shuttles or cool buildings, but in addition can be utilized to construct any new buildings. Like these blocks, a brand new expertise has been proposed to assemble atomic-sized blocks into new supplies.

A POSTECH analysis crew led by Professor Cheol-Joo Kim and Ph.D. candidates Seong-Jun Yang and Ju-Hyun Jung (Division of Chemical Engineering) in collaboration with Dr. Chang Cuk Hwang and Dr. Eunsook Lee (Pohang Accelerator Laboratory) and Professor Pinshane Y. Huang and Ph.D. candidate Edmund Han (College of Illinois Urbana-Champagne) has developed a expertise for assembling wafer-scale movies on the atomic degree. Lately printed because the entrance cowl paper of Nano Letters, the findings are a results of exactly designing the construction of supplies on the atomic degree.

Crystal movies composed of atoms supply various bodily properties based mostly on the modulation of their thickness or atomic buildings. Various the stacking configuration of those skinny movies — layer-by-layer or twisted — produces totally different bodily properties. Nonetheless, research performed to date have solely enabled meeting of atomically skinny crystals at a really small-scale as a result of assembling giant wafer-sized skinny movies simply contaminates their interfaces, hindering the emergence of recent properties.

To beat this, the researchers proposed a programmed crystal meeting of graphene and monolayer hexagonal boron nitride (hBN), assisted by van der Waals interactions. This new method produces wafer-scale movies of almost 100% pristine interfaces.

Making use of this new technique allows large-scale manufacturing of wafer-size synthetic crystalline movies which have been troublesome to make use of as precise units because of their small dimension. This expertise exhibits promise to assist develop new supplies that emit mild or conduct electrical energy since it may program the construction of a fabric on the atomic degree.

“The atomic-level meeting technique has been restricted to very small sizes, limiting the invention of properties and expertise growth to mere verification on the single-device degree,” remarked Professor Cheol-Joo Kim who led the research. He added, “The findings from this research have demonstrated the atomic-level precision meeting of single-crystalline supplies on the wafer-scale for the primary time, which will probably be relevant to the event of nanodevices sooner or later.”

This research was performed with the help from the Younger Researcher Program and the Artistic Supplies Discovery Program of the Nationwide Analysis Basis of Korea.

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