AuCl₃掺杂对碳纳米管晶体管的电学性能调控及特性分析

Carbon nanotube-based field-effect transistors (CNFETs), as a new generation of nanodevices, are still difficult to apply to actual logic circuits due to the lack of a mature threshold voltage control mechanism. Here in this work, a feasible and large-scale processing surface doping method is demonstrated to effectively modulate the threshold voltage of CNFETs through the p-type doping effect of gold chloride (AuCl₃). A comprehensive mapping from electrical parameters (I_on/I_off, V_th and mobility) to doping concentration is carefully investigated, demonstrating a p-doping effect induced by surface charge transfer between Au³⁺ and carbon nanotube networks (CNTs). Threshold voltage of CNFETs can be effectively adjusted by varying the doping concentration. More importantly, the devices doped with low concentration AuCl₃exhibit good electrical properties including greatly improved electrical conductivity, 2-3 times higher in mobility than intrinsic carbon nanotubes. Furthermore, the effects of annealing on the electrical properties of the AuCl₃-doping CNFETs are studied, demonstrating that the p-type doping effect reaches the optimized state at a temperature of 50 ℃. Finally, first-principles calculation method is used to verify the doping control mechanism of Au³⁺to carbon nanotubes. This research provides important guidance for realizing large-area low-power logic circuits and high-performance electronic devices in the future.