期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 18, 页码 21635-21644出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c03722
关键词
solution-processed; resistive switching; memristor; nanocrystals; perovskites
资金
- NSF Directorate of Engineering [CBET-1706113]
- European Union's Horizon 2020 Research and Innovation Programme under the Marie SklodowskaCurie Grant [722071]
- National Defense Science and Engineering Graduate (NDSEG) Fellowship
- National Science Foundation NRTSMLS program [DGE-1545399]
- Marie Curie Actions (MSCA) [722071] Funding Source: Marie Curie Actions (MSCA)
Recent advances in memristive nanocrystal assemblies have leveraged controllable colloidal chemistry to induce a wide range of defect-mediated electrochemical reactions and switching phenomena, while modulating active parameters. By systematically comparing nanoribbon heterogeneity and size distributions, the effects of nanocrystal size, packing density, and A-site substitution on operating voltage and switching mechanism were studied, providing insights for the fabrication of solution-processed, memristive nanocrystal assemblies.
Recent advances in memristive nanocrystal assemblies leverage controllable colloidal chemistry to induce a broad range of defect-mediated electrochemical reactions, switching phenomena, and modulate active parameters. The sample geometry of virtually all resistive switching studies involves thin film layers comprising monomodal diameter nanocrystals. Here we explore the evolution of bipolar and threshold resistive switching across highly ordered, solution-processed nanoribbon assemblies and mixtures comprising BaZrO3 (BZO) and SrZrO3 (SZO) nanocrystals. The effects of nanocrystal size, packing density, and A-site substitution on operating voltage (V-SET and V-TH) and switching mechanism were studied through a systematic comparison of nanoribbon heterogeneity (i.e., BZO-BZO vs BZO-SZO) and monomodal vs bimodal size distributions (i.e., small-small and small-large). Analysis of the current-voltage response confirms that tip-induced, trap-mediated space-charge-limited current and trap-assisted tunneling processes drive the low- and high-resistance states, respectively. Our results demonstrate that both smaller nanocrystals and heavier alkaline earth substitution decrease the onset voltage and improve stability and state retention of monomodal assemblies and bimodal nanocrystal mixtures, thus providing a base correlation that informs fabrication of solution-processed, memristive nanocrystal assemblies.
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