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In recent years, we have researched a series of new dithieno[2, 3-b: 3, 2-d]thiophene (DTT)-based semiconductors end-capped with phenyl, phenylethylene and thienylethylene are studied.Conducting probe atomic force microscope (C-AFM) and Kelvin probe force microscope (KFM) were also used to characterize the electronic transport behavior and surface potential distribution respectively.