期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 11, 页码 1440-1449出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201202170
关键词
crossbar arrays; unipolar resistive switching; Schottky-type diodes
类别
资金
- National Research Program for Nano Semiconductor Apparatus Development
- Korea Ministry of Knowledge and Economy [10034831]
- National Research Foundation (NRF) of Korea [2012040157]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10034831] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Various array types of 1-diode and 1-resistor stacked crossbar array (1D1R CA) devices composed of a Schottky diode (SD) (Pt/TiO2/Ti/Pt) and a resistive switching (RS) memory cell (Pt/TiO2/Pt) are fabricated and their performances are investigated. The unit cell of the 1D1R CA device shows high RS resistance ratio (approximate to 103 at 1.5 V) between low and high resistance state (LRS and HRS), and high rectification ratio (approximate to 105) between LRS and reverse-state SD. It also shows a short RS time of <50 ns for SET (resistance transition from HRS to LRS), and approximate to 600 ns for RESET (resistance transition from LRS to HRS), as well as stable RS endurance and data retention characteristics. It is experimentally confirmed that the selected unit cell in HRS (logically the off state) is stably readable when it is surrounded by unselected LRS (logically the on state) cells, in an array of up to 32 x 32 cells. The SD, as a highly non-linear resistor, appropriately controls the conducting path formation during the switching and protects the memory element from the noise during retention.
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