Details

Autor(en) / Beteiligte

• Al Balushi, Zakaria Y.
• Wang, Ke
• Ghosh, Ram Krishna
• Vilá, Rafael A.
• Eichfeld, Sarah M.
• Caldwell, Joshua D.
• Qin, Xiaoye
• Lin, Yu-Chuan
• DeSario, Paul A.
• Stone, Greg
• Subramanian, Shruti
• Paul, Dennis F.
• Wallace, Robert M.
• Datta, Suman
• Redwing, Joan M.
• Robinson, Joshua A.

Titel

Two-dimensional gallium nitride realized via graphene encapsulation

Ist Teil von

• Nature materials, 2016-11, Vol.15 (11), p.1166-1171

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A method to synthesize 2D layers of gallium nitride on SiC is reported. Epitaxial graphene preliminarily grown on SiC allows intercalation of gallium atoms on the SiC substrate and stabilizes the 2D gallium nitride islands formed by ammonolysis. The spectrum of two-dimensional (2D) and layered materials ‘beyond graphene’ offers a remarkable platform to study new phenomena in condensed matter physics. Among these materials, layered hexagonal boron nitride (hBN), with its wide bandgap energy (∼5.0–6.0 eV), has clearly established that 2D nitrides are key to advancing 2D devices 1 . A gap, however, remains between the theoretical prediction of 2D nitrides ‘beyond hBN’ 2 , 3 and experimental realization of such structures. Here we demonstrate the synthesis of 2D gallium nitride (GaN) via a migration-enhanced encapsulated growth (MEEG) technique utilizing epitaxial graphene. We theoretically predict and experimentally validate that the atomic structure of 2D GaN grown via MEEG is notably different from reported theory 2 , 3 , 4 . Moreover, we establish that graphene plays a critical role in stabilizing the direct-bandgap (nearly 5.0 eV), 2D buckled structure. Our results provide a foundation for discovery and stabilization of 2D nitrides that are difficult to prepare via traditional synthesis.