TY  - JOUR
AU  - Wang, Jiangjing
AU  - Ronneberger, Ider
AU  - Zhou, Ling
AU  - Lu, Lu
AU  - Deringer, Volker L.
AU  - Zhang, Baiyu
AU  - Tian, Lin
AU  - Du, Hongchu
AU  - Jia, Chunlin
AU  - Qian, Xiaofeng
AU  - Wuttig, Matthias
AU  - Mazzarello, Riccardo
AU  - Zhang, Wei
TI  - Unconventional two-dimensional germanium dichalcogenides
JO  - Nanoscale
VL  - 10
IS  - 16
SN  - 2040-3372
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2019-01070
SP  - 7363 - 7368
PY  - 2018
AB  - The recently discovered two-dimensional (2D) group IV chalcogenides attract much attention owing to their novel electronic and photonic properties. All the reported materials of this class favor (distorted) octahedral coordination via p bonding; by contrast, in the dichalcogenides where the bonding tendency approaches sp3, no corresponding 2D phase has been realized so far. Here, by engineering the composition of a chalcogenide heterostructure, the hitherto elusive GeTe2 is experimentally observed in a confined 2D environment. Density functional theory simulations predict the existence of a freestanding monolayer of octahedrally coordinated GeTe2 under tensile strain, and the existence of GeSe2 and GeS2 in the same form under equilibrium conditions. These 2D germanium dichalcogenides are either metallic or narrow gap semiconducting, and may lead to new applications in nanoscale electronics.
LB  - PUB:(DE-HGF)16
C6  - pmid:29637969
UR  - <Go to ISI:>//WOS:000431030000005
DO  - DOI:10.1039/C8NR01747F
UR  - https://juser.fz-juelich.de/record/860295
ER  -