High-performance n-channel organic thin-film transistors based on the dual effects of heterojunction and surface modification

This paper presents two n-channel organic heterojunctiontransistors with modified insulator by usinghexadecafluorophthalocyaninatocopper (F₁₆CuPc)/copperphthalocyanine (CuPc) and F₁₆CuPc/pentacene as the activelayers. Compared with a single-layer device, it reports that animproved field-effect mobility and a 6-fold higher drain current areobserved. The highest mobility of 0.081~cm²/(V.s) wasobtained from F₁₆CuPc/CuPc heterojunction devices. This resultis attributed to the dual effects of the organic heterojunction andinterface modification. Furthermore, for two heterojunction devices,the performance of the F₁₆CuPc/CuPc-based transistor is better thanthat of F₁₆CuPc/pentacene. This is attributed to themorphologic match of two organic components.