1 School of Aeronautics and Astronautics, Central South University, Changsha 410083, China 2 Zhejiang Energy Group R & D Institute Co., Ltd., Hangzhou 310003, China 3 Zhejiang Key Laboratory of Research on High Efficiency Energy Saving and Pollutant Control Technology of Thermal Power Generation, Hangzhou 311121, China
Abstract: Memristor is one of the most promising next-generation non-volatile memories, showing great application potential in new non-volatile storage, logic operation and brain nerve function simulation. At present, due to the dispersion of memristor resistance changing parameters as well as poor device repeatability, further development has been seriously hindered. The selected materials in constituent are becoming more abundant and diverse owing to the varied heterogeneous structural design methods. The structure and relative composition of heterostructure can be tuned with great flexibility through changing the thickness of the inserted layer. On the other hand, the interface barriers and charge trapping effects induced by the artificially constructed interface heterojunction inside the material have been placing additional adjustments to the improved performance of the memristor, which is believed to be a very effective method for regulating the performance of memristors and revealing the mechanism of memristor resistance changes. By studying heterostructure memristors, it is acknowledged that the power consumption of a single device, the stability of a device, and the durability of a device have a pronounced improvement compared to that of single-layer oxide devices. The heterostructural memristor has unique advantages in simulating artificial synapse and neuromorphic circuit applications. This work summarizes the latest research progress of heterostructural memristors, including the selection and suitability of material system, device structural design, property, mechanism and its potential application, and the limitations of current study are pointed out. This review aims to offer a certain basis for the structural design, preparation and application of heterostructure memristors.
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