研究目的
To develop a cost-effective and rapidly produced ZnO thin film memristive device using the doctor blade method for nonvolatile memory applications, with low resistive switching voltage and high memory window.
研究成果
The developed ZnO thin film memristive device exhibits excellent bipolar resistive switching with low voltage (±0.8 V), high memory window (103), good endurance (102 cycles), and retention (102 seconds). It operates via a filamentary mechanism and SCLC conduction, making it suitable for nonvolatile memory applications. However, it is classified as a memristive device rather than an ideal memristor due to asymmetric characteristics.
研究不足
The device showed double-valued charge-magnetic flux characteristics at HRS due to incomplete filament breaking and parasitic effects, indicating non-ideal memristor behavior. Endurance was tested for only 102 cycles and retention for 102 seconds, which may be insufficient for long-term applications. The fabrication process, while cost-effective, might not be scalable for mass production without further optimization.
1:Experimental Design and Method Selection:
The study used the doctor blade method for thin film deposition and hydrothermal synthesis for ZnO powder. Electrical characterizations were performed using an electrochemical workstation and memristor characterization platform.
2:Sample Selection and Data Sources:
ZnO powder was synthesized from zinc acetate and ammonia. FTO-coated glass substrates were used as bottom electrodes.
3:List of Experimental Equipment and Materials:
Materials included zinc acetate, ammonia, ethyl cellulose, lauric acid, terpineol, ethanol, FTO substrates. Equipment included a magnetic stirrer, autoclave, mortar and pestle, thermal evaporation system, SEM, XRD, electrochemical workstation, and memristor characterization platform.
4:Experimental Procedures and Operational Workflow:
ZnO powder was synthesized hydrothermally, made into a paste, coated on FTO using doctor blade, sintered and calcined, then Ag top electrode was deposited via thermal evaporation. Morphological, structural, and electrical characterizations were conducted.
5:Data Analysis Methods:
XRD data analyzed with Scherer's relation for crystallite size. Electrical data analyzed for I-V characteristics, endurance, retention, and conduction mechanisms using logarithmic plots and Child's law.
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