Ambipolar organic heterojunction transistors based on F16CuPc/CuPc with a MoO3 buffer layer*

We fabricated heterojunction organic field-effect transistors (OFETs) using copper phthalocyanine (CuPc) and hexadecafluorophtholocyaninatocopper (F 16 CuPc) as hole transport layer and electron transport layer, respectively.Compared with F 16 CuPc based OFETs, the electron field-effect mobility in the heterojunction OFETs increased from 3.1×10 -3 to 8.7×10 -3 cm 2 /(V·s), but the p-type behavior was not observed.To enhanced the hole injection, we modified the source-drain electrodes using the MoO 3 buffer layer, and the hole injection can be effectively improved.Eventually, the ambipolar transport characteristics of the CuPc/F 16 CuPc based OFETs with a MoO 3 buffer layer were achieved, and the field-effect mobilities of electron and hole were 2.5×10 -3 and 3.1×10 -3 cm 2 /(V·s), respectively.