Low‐Power Memristive Logic Device Enabled by Controllable Oxidation of 2D HfSe2 for In‐Memory Computing

• DOI: 10.1002/advs.202005038
• Publication Date: 2021-05-29T15:46:46Z
• Authors: Long Liu; Yi Li; Xiaodi Huang; Jia Chen; Zhe Yang; Kan‐Hao Xue; Ming Xu; Huawei Chen; Peng Zhou; Xiangshui Miao
• Keywords: memristors; oxidation; resistive switching; in‐memory computing; Science; low‐power consumption; Q; 2D HfSe2; 02 engineering and technology; 0210 nano-technology; 7. Clean energy; Research Articles

AbstractMemristive logic device is a promising unit for beyond von Neumann computing systems and 2D materials are widely used because of their controllable interfacial properties. Most of these 2D memristive devices, however, are made from semiconducting chalcogenides which fail to gate the off‐state current. To this end, a crossbar device using 2D HfSe2 is fabricated, and then the top layers are oxidized into “high‐k” dielectric HfSexOy via oxygen plasma treatment, so that the cell resistance can be remarkably increased. This two‐terminal Ti/HfSexOy/HfSe2/Au device exhibits excellent forming‐free resistive switching performance with high switching speed (<50 ns), low operation voltage (<3 V), large switching window (103), and good data retention. Most importantly, the operation current and the power consumption reach 100 pA and 0.1 fJ to 0.1 pJ, much lower than other HfO based memristors. A functionally complete low‐power Boolean logic is experimentally demonstrated using the memristive device, allowing it in the application of energy‐efficient in‐memory computing.