Charge-transfer effect at the interface of phthalocyanine-electrode contact studied by scanning tunneling spectroscopy.
Scanning tunneling microscopy (STM) and spectroscopy (STS) are used in this work to investigate the charge-transfer effect at the molecule-substrate interface of substituted metal phthalocyanines. STS results revealed that the apparent energy gaps for both fluorinated phthalocyanines and unsubstituted phthalocyanines are essentially the same, which agree with the hybrid density functional calculations. More interestingly, there is a systematic shift of the energy level of valence bands, possibly as the result of charge-transfer effect at the molecule-substrate interface.
Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, PRC.
Sheng-Bin
SB
Lei
Ke
K
Deng
De-Liang
DL
Yang
Qing-Dao
QD
Zeng
Chen
C
Wang