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

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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 languageEnglish
Article number171607
JournalApplied physics letters
Issue number17
Publication statusPublished - 23 Apr 2018


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