NOVELTY - A thin film transistor comprises thin film (70) of organic semiconductor material comprising N,N'-di(aralkyl)-substituted perylene-based tetracarboxylic diimide compound having (un)substituted carbocyclic aromatic ring system attached to each imide nitrogen atom through a divalent hydrocarbon group. The substituents on each carbocyclic aromatic ring system, if any, comprise at least one electron donating organic substituent.    USE - For electronic devices such as thin film semiconductor device e.g. integrated circuit, active-matrix display, solar cell (all claimed), logic circuits, shift register, smart cards, memory device, radio-frequency identification tag, ring oscillator and inverter circuit.    ADVANTAGE - The thin film transistor has favorable current on/off ratio by containing n-type semiconductor material exhibiting favorable mobility.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) electronic device selected from group consisting of integrated circuits, active-matrix display, and solar cells comprising several thin film transistors;    (2) process for fabricating thin film semiconductor device, which involves (a) depositing thin film of n-channel organic semiconductor material comprising N,N'-di(arylalkyl)-substituted perylene-based tetracarboxylic diimide compound, on a substrate (28), such that the organic semiconductor material exhibits a field effect electron mobility of more than 0.01 cm2/Vs, (b) forming a spaced apart source electrode (20) and drain electrode (30), and (c) forming a gate electrode (44) spaced apart from the organic semiconductor material, where the source electrode and the drain electrode are separated and electrically connected with n-channel semiconductor film; and    (3) integrated circuit comprising several thin film transistors.    DESCRIPTION OF DRAWING(S) - The figure shows the cross-sectional view of organic thin film transistor.    source electrode (20)    substrate (28)    drain electrode (30)    gate electrode (44)    gate dielectric (56)    semiconductor (70)