Optimal electron doping of a C60 monolayer on Cu(111) via interface reconstruction.
We demonstrate the charge state of C60 on a Cu(111) surface can be made optimal, i.e., forming C60(3-) as required for superconductivity in bulk alkali-doped C60, purely through interface reconstruction rather than with foreign dopants. We link the origin of the C60(3-) charge state to a reconstructed interface with ordered (4x4) 7-atom vacancy holes in the surface. In contrast, C60 adsorbed on unreconstructed Cu(111) receives a much smaller amount of electrons. Our results illustrate a definitive interface effect that affects the electronic properties of molecule-electrode contact.
Pai
Woei Wu
WW
Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan. wpai@ntu.edu.tw
Jeng
H T
HT
Cheng
C-M
CM
Lin
C-H
CH
Xiao
Xudong
X
Zhao
Aidi
A
Zhang
Xieqiu
X
Xu
Geng
G
Shi
X Q
XQ
Van Hove
M A
MA
Hsue
C-S
CS
Tsuei
K-D
KD