Electrical study of new anthracene derivatives for electronics applications

Due to the holes high transport mobility, anthracene derivates are widely used for the elaboration of OLEDs and other organic thin-layer-based electronic, such as transistors and photovoltaic cells. This study aims to investigate the electric properties of two new anthracene derivatives: 9-{[4-({[4-(9 anthrylmethoxy)phenyl]sulfanyl}methyl)] methyl]anthracene (TDP-AN) and 4-(9-anthrylmethoxy) benzyl[4-(9-anthrylmethoxy)phenyl]sulfone (BPS-AN). The main difference between them is related to the functional group between the two central phenyls. Conductance measurements results show a frequency-independent behaviour, for low frequencies ranging between 0.1 and 100 KHz, while they exhibit a power law model for higher ones. BPS-AN was found more conductive than the TDP-AN. Impedance spectroscopy (IS) was then investigated to understand the charge carrier mechanisms in both TDP-AN and BPS-AN molecules. Measurements were carried out in the frequency range 100 Hz – 10 MHz at different bias voltages (from 0 V to 3 V). The obtained results permitted to confirm that the conductivity of BPS-AN is superior to that of TDP-AN.