Ambipolar organic transistors with high on/off ratio by introducing a modified layer of gate insulator

作者：Zhang, Yu; Wei, Xicheng; Zhang, Hao; Chen, Xiong; Wang, Jun^*

来源：Applied Surface Science, 2018, 427: 452-457.

DOI：10.1016/j.apsusc.2017.08.116

• Ambipolar charge transport
• Oxotitanium phthalocyanine
• Modified layer

Oxotitanium phthalocyanine (TiOPc)-based organic thin-film transistors (OTFTs) were fabricated by introducing para-sexiphenyl (p-6P) thin-film as the modified layer of gate insulator. The typical ambipolar transport behavior may be observed in ambient, which exhibited a balanced charge transport with a hole mobility of 8 x 10(-2) and an electron mobility of 3 x 10(-2) cm(2)/V.s. More importantly, the on/off ratio for both n- and p-type accumulation-mode has reached 10(4) and simultaneously exhibited good air-stability. Furthermore, capacitance-voltage characteristics were presented in order to further clarify the operation procedures of two kinds of charge-carriers. The excellent ambipolar transport behavior is attributed to the surface modification properties of p-6P for better electron transport and highly ordered thin-film morphology of TiOPc. These results demonstrate that the surface characteristics of insulator play a crucial role in realizing ambipolar devices.

• 出版日期2018-1-1
• 单位上海大学