Fabrication of Ambipolar Organic Heterojunction Transistors with Various Sexithiophene Alkyl-Substituted Derivatives

Abstract

Ambipolar transport has been realized in organic heterojunction transistors with n-type fluorinated copper phthalocyanine (F16CuPc) as the first semiconductor and p-type α-sexithiophene (α6T) and α,α'-dihexylsexithiophene as the second semiconductors. For the F16CuPc/α6T heterojunction transistor, higher device performance and ambioplar mobilities on the same order of as those of their single layer devices were obtained. Only the p-channel operating characteristics were observed for the F16CuPc/α,α'-diethylsexithiophene heterojunction device. The large difference in their device performance was attributed to the ratio of hole mobility to electron mobility.