Electronic sensory behavior of titanylphthalocyanine revealed by scanning tunneling spectroscopy and cyclic voltammetry methods

Abstract

The electronic characteristics of titanylphthalocyanine (TiOPc) were examined by scanning tunneling microscopy and spectroscopy (STM/STS) and electrochemical cyclic voltammetry (CV) methods. The STS spectra of TiOPc molecules acquired under ambient conditions suggest the same semiconducting characteristics as those deduced from the CV results in o-dichlorobenzene (DCB) exposed to air while opposite to those under N₂ protection. These results revealed that oxygen doping in air greatly affected the electronic structures of TiOPc molecules in ultra-thin films.