Variable-temperature scanning tunneling microscopy and scanning tunneling spectroscopy study on copper phthalocyanine ultrathin films on a Au(111) surface.
Variable-temperature high-resolution scanning tunneling microscopy (STM) images reveal that well-ordered copper phthalocyanine (CuPc) strips can be self-assembled by depositing CuPc molecules on a Au(111) surface. The self-assembled strips are supposed to result from the balance of the intermolecular interaction and the interaction between the molecules and substrate during annealing. The energy band (approximately 1.9-2.1 eV) of CuPc, measured by scanning tunneling spectroscopy (STS), is comparable to the optical band gap (approximately 1.7 eV). Spectroscopic measurements confirm that a dipole layer and/or an effect of image force exist at the CuPc/Au(111) interface.
Xu
M S
MS
Department of Electronic Engineering, Materials Science and Technology Research Center, Chinese University of Hong Kong, Shatin, N.T., Hong Kong.
Xu
J B
JB
Xue
K
K
An
J
J
He
J Z
JZ
Wilson
I H
IH
D003460:Crystallization / Q000379:methods; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods; D006046:Gold / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D008422:Materials Testing / Q000295:instrumentation / Q000379:methods*; D008832:Microchemistry / Q000379:methods; D016252:Microscopy, Scanning Tunneling / Q000379:methods*; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D009942:Organometallic Compounds / Q000737:chemistry*; D012666:Semiconductors; D013057:Spectrum Analysis / Q000379:methods*; D013499:Surface Properties; D013696:Temperature
D007211:Indoles; D009942:Organometallic Compounds; C015445:copper phthalocyanine; D006046:Gold