Electronic Structure of organic Titanium bis-phthalocyanine on InAs(001)4x2-c(8x2)

We investigated the electronic structure of ultra thin interface of organic titanium bis-phthalocyanine TiPc2 deposited on InAs(001)( )c-( ) clean surface, by means of high-resolution core-levels and valence band (VB) photoelectron spectroscopies. In4d, As3d, and C1s core levels were measured for different TiPc2 thicknesses up to 1 monolayer. Surface core level shifts were found on both In4d and As3d core levels. These shifts originate from the interaction between c( ) InAs reconstruction and organic molecules suggesting the presence of strong bounds. C1s core level exhibits a line shape attributed to the C-C and C-N bonds. The VB spectroscopy shows dramatic changes related to the interaction of the TiPc2 molecule with the InAs related surface states.