Triazine-based graphitic carbon nitride: a two-dimensional semiconductor.
Graphitic carbon nitride has been predicted to be structurally analogous to carbon-only graphite, yet with an inherent bandgap. We have grown, for the first time, macroscopically large crystalline thin films of triazine-based, graphitic carbon nitride (TGCN) using an ionothermal, interfacial reaction starting with the abundant monomer dicyandiamide. The films consist of stacked, two-dimensional (2D) crystals between a few and several hundreds of atomic layers in thickness. Scanning force and transmission electron microscopy show long-range, in-plane order, while optical spectroscopy, X-ray photoelectron spectroscopy, and density functional theory calculations corroborate a direct bandgap between 1.6 and 2.0 eV. Thus TGCN is of interest for electronic devices, such as field-effect transistors and light-emitting diodes.
Universität Ulm, Materialwissenschaftliche Elektronenmikroskopie, Albert-Einstein-Allee 11, 89081 Ulm (Germany).
Gerardo
G
Algara-Siller
Nikolai
N
Severin
Samantha Y
SY
Chong
Torbjörn
T
Björkman
Robert G
RG
Palgrave
Andrea
A
Laybourn
Markus
M
Antonietti
Yaroslav Z
YZ
Khimyak
Arkady V
AV
Krasheninnikov
Jürgen P
JP
Rabe
Ute
U
Kaiser
Andrew I
AI
Cooper
Arne
A
Thomas
Michael J
MJ
Bojdys
D006108:Graphite / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D046529:Microscopy, Electron, Transmission; D009570:Nitriles / Q000737:chemistry*; D012666:Semiconductors; D014227:Triazines / Q000737:chemistry*; D014961:X-Ray Diffraction
D009570:Nitriles; D014227:Triazines; C011206:cyanogen; D006108:Graphite
carbon nitride; graphene; semiconductor; thin films