Low voltage & controlled switching of MoS2-GO resistive layers based ReRAM for non-volatile memory applications

Choudhary, Sumit and Soni, Mahesh and Sharma, Satinder K. (2019) Low voltage & controlled switching of MoS2-GO resistive layers based ReRAM for non-volatile memory applications. Semiconductor Science and Technology, 34 (8): 085009. ISSN 0268-1242

Abstract

Emerging information technology and data deluge foster the unprecedented demands of higher chip density, clocking speed, data storage and lower power dissipation for on-chip non-volatile memories (NVMs). Here, two types of metal-insulator-metal (MIM) based NVM structures were fabricated and demonstrated involving controlled functionalization of molybdenum disulfide (MoS2) and graphene oxide (GO) nanocomposite as a resistive switching layer. The first type of device constitutes Aluminum (Al) top and bottom electrode resulting in the Al/MoS2-GO/Al structure. While the second type of device uses Al top electrode and Indium Tin Oxide (ITO) bottom electrode resulting in Al/MoS2-GO/ITO. The current-voltage (I-V) characteristics for fabricated Al/MoS2-GO/Al and Al/MoS2-GO/ITO MIM structures exhibited considerable I-ON/I-OFF ratio of similar to 10(2) (SET and RESET state at 0.5 V and -0.4 V) and similar to 10(1) (SET and RESET state at 0.3 V and -1V), respectively. The I-V characteristics for Al/MoS2-GO/Al MIM structure showed low voltage switching, substantial memory retention similar to 10(4) s and endurance for up to 25 cycles. The low voltage and controlled switching operation for Al/MoS2-GO/Al MIM structures may be attributed to the presence of a large number of oxygen vacancies, defects in MoS2-GO, promoting enhanced charge hopping via interfacial oxide at MoS2-GO/Al interface as compared to MoS2-GO/ITO.