title: Position-dependent performance of copper phthalocyanine based field-effect transistors by gold nanoparticles modification.
abstract: A facile fabrication and characteristics of copper phthalocyanine (CuPc)-based organic field-effect transistor (OFET) using the gold nanoparticles (Au NPs) modification is reported, thereby achieving highly improved performance. The effect of Au NPs located at three different positions, that is, at the SiO2/CuPc interface (device B), embedding in the middle of CuPc layer (device C), and on the top of CuPc layer (device D), is investigated, and the results show that device D has the best performance. Compared with the device without Au NPs (reference device A), device D displays an improvement of field-effect mobility (μ(sat)) from 1.65 × 10(-3) to 5.51 × 10(-3) cm(2) V(-1) s(-1), and threshold voltage decreases from -23.24 to -16.12 V. Therefore, a strategy for the performance improvement of the CuPc-based OFET with large field-effect mobility and saturation drain current is developed, on the basis of the concept of nanoscale Au modification. The model of an additional electron transport channel formation by FET operation at the Au NPs/CuPc interface is therefore proposed to explain the observed performance improvement. Optimum CuPc thickness is confirmed to be about 50 nm in the present study. The device-to-device uniformity and time stability are discussed for future application.
authors.affiliation: Institute of Microelectronics, School of Physical Science and Technology, Lanzhou University, South Tianshui Road 222#, Lanzhou 730000, People's Republic of China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Luo
authors.forename: Yao
authors.initials: Y
authors.lastname: Li
authors.forename: Wenli
authors.initials: W
authors.lastname: Lv
authors.forename: Feiyu
authors.initials: F
authors.lastname: Zhao
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Yingquan
authors.initials: Y
authors.lastname: Peng
authors.forename: Zhanwei
authors.initials: Z
authors.lastname: Wen
authors.forename: Junkang
authors.initials: J
authors.lastname: Zhong
authors.forename: Jianping
authors.initials: J
authors.lastname: Zhang
mesh_terms: D006046:Gold / Q000737:chemistry*; D006801:Humans; D007211:Indoles / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D009942:Organometallic Compounds / Q000737:chemistry*; D013499:Surface Properties; D014173:Transistors, Electronic
chemical_list: D007211:Indoles; D009942:Organometallic Compounds; C015445:copper phthalocyanine; D006046:Gold