Light Induced Electrical Properties of MoS_2 Based Field Effect Transistor with Phthalocyanine Molecule Adsorption

摘要

Two-dimensional transition metal dichalcogenides such as MoS_2, one of the transition-metal dichalcogenides, that belongs to the unique physical, optical and electrical properties with high on/off ratio and high mobility correlated with its 2D ultrathin atomic layer structure . Phthalocyanines (MPcs) are a promising class of molecules that have been studied extensively as the active material in organic electronics .In this study, we investigated the light induced electrical properties of MoS2 field effect transistor after phthalocyanine (CoPc, FePc, MnPc, VoPc, CuPc & H_2Pc) molecule adsorption. Figure 1 illustrates the schematic of usual MoS_2 FET device we used in this study. Figure 2 shows the wavelength(nm)-photo current(A) curve of CoPc/MoS_2 surface. The enhancements of the photo current, i_(Ph) (A), by CoPc adsorption are 〜3, 6.5 and 9.5 times at ~660 nm for thethickness of 2, 10 and 20 A respectively. Other phthalocyanine molecules also exhibited photoenhancement properties with light.