Emerging memristors can be used as artificial synapses for emulating memory and computational functions.In this work,inspired by the memristive properties of tantalum dioxide,we designed a memristor with a structure o...Emerging memristors can be used as artificial synapses for emulating memory and computational functions.In this work,inspired by the memristive properties of tantalum dioxide,we designed a memristor with a structure of TiN/Ta2O5-x/HfxZr1-xO2(x=0.5)/Pt(TTHZOP).The device conductance can be continuously tuned by adjusting the voltage pulse parameters(i.e.,amplitude,width,and number)of voltage sweeps.Furthermore,for both of negative and positive parts,the current-voltage curves of the sweep cycle appear to better adjust the gradual distribution in successive twenty cycles.According to the fine fitting results of twenty positive and negative current-voltage(I-V)curves,the probability of an electron jumping over an energy barrier and the width of the energy barrier were analyzed in detail.It is found that the electron tunneling mechanism at the interface is responsible for gradual conduction change under successive external electrical stimulation consisting of both bulk and interface effects.The proposed TTHZOP memristor is a promising candidate in potential applications that mimic artificial biosynaptic adaptation and analog brain computation.展开更多
基金supported by the National Natural Science Foundation of China(61674050 and 61874158)the Outstanding Youth Funding of Hebei University(A2018201231)+2 种基金the Support Program for the Top Young Talents of Hebei Province(70280011807)the Hundred Persons Plan of Hebei Province(E2018050004 and E2018050003)the Supporting Plan for 100 Excellent Innovative Talents in Colleges and Universities of Hebei Province(SLRC2019018)。
文摘Emerging memristors can be used as artificial synapses for emulating memory and computational functions.In this work,inspired by the memristive properties of tantalum dioxide,we designed a memristor with a structure of TiN/Ta2O5-x/HfxZr1-xO2(x=0.5)/Pt(TTHZOP).The device conductance can be continuously tuned by adjusting the voltage pulse parameters(i.e.,amplitude,width,and number)of voltage sweeps.Furthermore,for both of negative and positive parts,the current-voltage curves of the sweep cycle appear to better adjust the gradual distribution in successive twenty cycles.According to the fine fitting results of twenty positive and negative current-voltage(I-V)curves,the probability of an electron jumping over an energy barrier and the width of the energy barrier were analyzed in detail.It is found that the electron tunneling mechanism at the interface is responsible for gradual conduction change under successive external electrical stimulation consisting of both bulk and interface effects.The proposed TTHZOP memristor is a promising candidate in potential applications that mimic artificial biosynaptic adaptation and analog brain computation.
