Depletion- and ambipolar-mode field-effect transistors based on the organic heterojunction composed of pentacene and hexadecafluorophtholocyaninatocopper

作者：Hong, Fei; Xing, Feifei; Gu, Wen; Jin, Weipeng; Zhang, Jianhua; Wang, Jun^*

来源：Synthetic Metals, 2010, 160(5-6): 475-478.

DOI：10.1016/j.synthmet.2009.11.034

• Organic heterojunction
• Threshold voltage
• Depletion
• Ambipolar

We investigated heterojunction organic field-effect transistors (OFETs) using pentacene and hexadecafluorophtholocyaninatocopper (F16CuPc) as double active layers. Two operation modes including depletion- and ambipolar-type were observed depending on the deposition order of two organic films. Depletion-mode was firstly observed from that devices with pentacene as the bottom layer and F16CuPc as the top layer, which was attributed to dipole effects originated from the pentacene/F16CuPc interface. Then improved device performances were obtained with mobility from 0.87 to 1.06 cm(2)/V s, and threshold voltage shifted from -20 to +25 V as compared with conventional pentacene-based devices. Furthermore, the heterojunction OFETs exhibited typical ambipolar transport when alternating the deposition order which exhibited ambipolar mobilities with 0.06 cm(2)/V s for electron and 0.0025 cm(2)/V s for of two films, hole, respectively. All results implied the utilization of heterojunction can effectively improve the device performances of OFET, and operation mode strongly on the deposition order of two films.

• 出版日期2010-3
• 单位上海大学