Centimetre-scale single crystal α-MoO3: oxygen assisted self-standing growth and low-energy consumption synaptic devices. Issue 3 (19th December 2022)

• Record Type: Journal Article
• Authors: Shan, Xin; Wu, Zeyu; Xie, Yangyang; Lin, Xin; Zhou, Baozeng; Zhang, Yupeng; Yan, Xiaobing; Ren, Tianling; Wang, Fang; Zhang, Kailiang
• Is Part Of: Nanoscale. Volume 15:Issue 3(2023)
• Page Start: 1200
• Page End: 1209
• Publication Date: 2022-12-19
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr04530c
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The centimeter-scale single crystal α-MoO3 was developed via oxygen assisted self-standing growth. The Ti/α-MoO3 /Au memristor simulated synaptic properties and achieved low-energy consumption conductance update. Abstract : High-density storage and neuromorphic devices based on 2D materials are hindered by large-scale growth. Moreover, the lack of a mature mechanism makes it difficult to obtain high-quality single crystals in large-scale 2D materials. In this work, we prepared a centimeter-scale single crystal α-MoO3 via an oxygen assisted substrate-free self-standing growth method and mechanism and constructed high-performance synaptic devices based on the centimeter-scale α-MoO3 . The oxygen assisted growth mechanism of α-MoO3 was developed from the periodic bond chain theory. The large-scale α-MoO3 is up to 2 cm and exhibits high homogeneity and single crystalline characteristic. Furthermore, with an optimized oxygen partial pressure (18%), the centimeter-scale α-MoO3 makes the as-prepared memristor achieve continuous conductance modulation. Moreover, the trap-controlled electron conducting mechanism of the memristor was demonstrated through I – V curve fitting analysis at various temperatures, in which the high resistance state section demonstrates space-charge-limited conduction (SCLC) mode. Moreover, the as-prepared α-MoO3 memristors exhibit low-energy consumption and well emulate the essential synaptic behaviors including excitatory/inhibitory postsynaptic current, paired-pulse facilitation and long-term plasticity.