Quasi-two-dimensi on al(2D)β-Ga2O3 is a rediscovered metal-oxide semiconductor with an ultra-wide bandgap of 4.6-4.9eV.It has been reported to be a promising material for next-generation power and radio frequency ele...Quasi-two-dimensi on al(2D)β-Ga2O3 is a rediscovered metal-oxide semiconductor with an ultra-wide bandgap of 4.6-4.9eV.It has been reported to be a promising material for next-generation power and radio frequency electronics.Field effect transistors(FETs)that can switch at high voltage are key compone nts in power and radio frequency devices,and reliable Ohmic con tacts are essential for high FET performance.However,obtaining low contact resistance onβ-Ga2O3 FETs is difficult since reactions betweenβ-Ga2O3 and metal contacts are not fully understood.Herein,we experimentally demonstrate the importanee of reactions at the metal/β-Ga2O3 interface and the corresponding effects of these reactions on FET performance.When Ti is employed as the metal contact,annealing ofβ-Ga2O3 FETs in argon can effectively transform Schottky contacts into Ohmic contacts and permit a large drain current density of-3.1 mA//μm.The contact resistance(Rcontact)between the Ti electrodes andβ-Ga2O3 decreased from^430 to^0.387Ω·mm after annealing.X-ray photoelectron spectroscopy(XPS)confirmed the formation of oxygen vacancies at the Ti/β-Ga2O3 interface after annealing,which is believed to cause the improved FET performance.The results of this study pave the way for greater application ofβ-Ga2O3 in electronics.展开更多
In this paper, the fluid dynamic performance for a new boat form grooved planing boats is analyzed, and the results of resistance tests for seven grooved planing boat models of different types are presented in the for...In this paper, the fluid dynamic performance for a new boat form grooved planing boats is analyzed, and the results of resistance tests for seven grooved planing boat models of different types are presented in the form of curves of attack angle and resistance-weight ratio versus Froude number. According to these curves, the effect of some parameters of the boat type on the resistance is analyzed.展开更多
文摘Quasi-two-dimensi on al(2D)β-Ga2O3 is a rediscovered metal-oxide semiconductor with an ultra-wide bandgap of 4.6-4.9eV.It has been reported to be a promising material for next-generation power and radio frequency electronics.Field effect transistors(FETs)that can switch at high voltage are key compone nts in power and radio frequency devices,and reliable Ohmic con tacts are essential for high FET performance.However,obtaining low contact resistance onβ-Ga2O3 FETs is difficult since reactions betweenβ-Ga2O3 and metal contacts are not fully understood.Herein,we experimentally demonstrate the importanee of reactions at the metal/β-Ga2O3 interface and the corresponding effects of these reactions on FET performance.When Ti is employed as the metal contact,annealing ofβ-Ga2O3 FETs in argon can effectively transform Schottky contacts into Ohmic contacts and permit a large drain current density of-3.1 mA//μm.The contact resistance(Rcontact)between the Ti electrodes andβ-Ga2O3 decreased from^430 to^0.387Ω·mm after annealing.X-ray photoelectron spectroscopy(XPS)confirmed the formation of oxygen vacancies at the Ti/β-Ga2O3 interface after annealing,which is believed to cause the improved FET performance.The results of this study pave the way for greater application ofβ-Ga2O3 in electronics.
文摘In this paper, the fluid dynamic performance for a new boat form grooved planing boats is analyzed, and the results of resistance tests for seven grooved planing boat models of different types are presented in the form of curves of attack angle and resistance-weight ratio versus Froude number. According to these curves, the effect of some parameters of the boat type on the resistance is analyzed.
