The Impact of Alkyl Phosphonic Acid Monolayer Modified Dielectrics on the Performance of n-Channel Organic Thin-Film Transistors

This study reported on the effect of the carbon chain length in alkyl phosphonic acid self-assembled monolayers on the performance of N, N'-ditridecyl-3,4,9,10-perylenetetracarboxylicdiimide (PTCDI-C-13) based n-channel organic thin film transistors. A trend of improving performance was observed with the increasing chain length of the self-assembled monolayer on the SiO2 dielectric. Mobility as high as 0.35 cm(2)/Vs and on/off current ratio of larger than 105 were achieved. These transistors are good candidates to match with p-channel pentacene organic thin film transistors to realize organic complementary metal oxide semiconductor circuits. The devices demonstrated no dependency on the alkyl chain length when tested in air.