News Summary

• Korean boffins use oxygen to stop crystals forming in the wrong places, aiming to get tech to commercial sector by 2030.
• The technique uses an etching flux to suppress the formation of new crystals everywhere within each patterned growth region except at its geometric center.
• When grown on a wafer, however, 2D semiconductor crystals typically start forming at random points, or "nucleation events occur stochastically at random sites within the growth region," as the paper puts it.