Bandgap opening in hydrogenated germanene

Q. Yao; L. Zhang; N.S. Kabanov; A.N. Rudenko; T. Arjmand; H. Rahimpour Soleimani; A.L. Klavsyuk; H.J.W. Zandvliet

doi:10.1063/1.5026745

Bandgap opening in hydrogenated germanene

Q. Yao, L. Zhang, N.S. Kabanov, A.N. Rudenko, T. Arjmand, H. Rahimpour Soleimani, A.L. Klavsyuk, H.J.W. Zandvliet

Physics of Interfaces and Nanomaterials

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Abstract

We have studied the hydrogenation of germanene synthesized on Ge₂Pt crystals using scanning tunneling microscopy and spectroscopy. The germanene honeycomb lattice is buckled and consists of two hexagonal sub-lattices that are slightly displaced with respect to each other. The hydrogen atoms adsorb exclusively on the Ge atoms of the upward buckled hexagonal sub-lattice. At a hydrogen exposure of about 100 L, the (1 × 1) buckled honeycomb structure of germanene converts to a (2 × 2) structure. Scanning tunneling spectra recorded on this (2 × 2) structure reveal the opening of a bandgap of about 0.2 eV. A fully (half) hydrogenated germanene surface is obtained after an exposure of about 9000 L hydrogen. The hydrogenated germanene, also referred to as germanane, has a sizeable bandgap of about 0.5 eV and is slightly n-type.

Original language	English
Article number	171607
Journal	Applied physics letters
Volume	112
Issue number	17
DOIs	https://doi.org/10.1063/1.5026745
Publication status	Published - 23 Apr 2018

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title = "Bandgap opening in hydrogenated germanene",

abstract = "We have studied the hydrogenation of germanene synthesized on Ge2Pt crystals using scanning tunneling microscopy and spectroscopy. The germanene honeycomb lattice is buckled and consists of two hexagonal sub-lattices that are slightly displaced with respect to each other. The hydrogen atoms adsorb exclusively on the Ge atoms of the upward buckled hexagonal sub-lattice. At a hydrogen exposure of about 100 L, the (1 × 1) buckled honeycomb structure of germanene converts to a (2 × 2) structure. Scanning tunneling spectra recorded on this (2 × 2) structure reveal the opening of a bandgap of about 0.2 eV. A fully (half) hydrogenated germanene surface is obtained after an exposure of about 9000 L hydrogen. The hydrogenated germanene, also referred to as germanane, has a sizeable bandgap of about 0.5 eV and is slightly n-type.",

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AU - Zhang, L.

AU - Kabanov, N.S.

AU - Rudenko, A.N.

AU - Arjmand, T.

AU - Rahimpour Soleimani, H.

AU - Klavsyuk, A.L.

AU - Zandvliet, H.J.W.

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AB - We have studied the hydrogenation of germanene synthesized on Ge2Pt crystals using scanning tunneling microscopy and spectroscopy. The germanene honeycomb lattice is buckled and consists of two hexagonal sub-lattices that are slightly displaced with respect to each other. The hydrogen atoms adsorb exclusively on the Ge atoms of the upward buckled hexagonal sub-lattice. At a hydrogen exposure of about 100 L, the (1 × 1) buckled honeycomb structure of germanene converts to a (2 × 2) structure. Scanning tunneling spectra recorded on this (2 × 2) structure reveal the opening of a bandgap of about 0.2 eV. A fully (half) hydrogenated germanene surface is obtained after an exposure of about 9000 L hydrogen. The hydrogenated germanene, also referred to as germanane, has a sizeable bandgap of about 0.5 eV and is slightly n-type.

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Bandgap opening in hydrogenated germanene

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