Mirror, mirror, who is the most efficient semiconductor of them all?

August 3, 2023

By: Jamie Oberdick

Editor’s note: This article originally appeared on Penn State News. It highlights work by researchers from Penn State’s Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) that may help speed development of 2D semiconductors. 2DCC-MIP is directed by Joan Redwing, professor of materials science and engineering and electrical engineering.

UNIVERSITY PARK, Pa. — The next generation of 2D semiconductor materials doesn’t like what it sees when it looks in the mirror. Current synthesizing approaches to make single-layer nanosheets of semiconducting material for atomically thin electronics develop a peculiar “mirror twin” defect when the material is deposited on single-crystal substrates like sapphire.  The synthesized nanosheet contains grain boundaries that act as a mirror, with the arrangement of atoms on each side organized in reflected opposition to one another.

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