article · ACS Materials Letters
Synthesising large-area two-dimensional covalent organic framework thin films has long been hindered by high-temperature and high-pressure methods that produce unprocessable powders. Researchers have developed a room-temperature liquid-liquid interface polymerisation method to create a vinylene-bridged covalent organic framework film with a fully sp2-carbon-linked skeleton. During the process, nanoscale spheres forming at the interface gradually assemble into self-standing, ordered thin films. When integrated into an aluminium and indium tin oxide device structure, the resulting thin film functions as a rewritable, nonvolatile electronic memory element. The device operates at a low turn-on threshold of positive 0.84 volts and displays bistable switching, which also allows it to execute fundamental OR logic operations. This demonstrates a workable pathway to processable carbon-linked framework films for electronic applications.
Conventional manufacturing of these carbon-based materials requires harsh conditions and yields rigid powders that cannot be turned into electronic components. Developing a room-temperature method to generate smooth, free-standing films allows advanced carbon frameworks to be incorporated directly into computer chips, potentially enabling energy-efficient nonvolatile memory and low-power logic devices.
This technology could be applied in nonvolatile memory storage and basic logic circuitry by semiconductor and electronic device developers. The work represents an early-stage laboratory demonstration, validated through a single proof-of-concept device architecture exhibiting low-voltage switching and simple OR gate operation. Further developmental work and process scaling will be required before any commercial adoption in integrated electronics is viable.
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The development of large-area two-dimensional all sp2 carbon-linked covalent organic frameworks (COFs) film still remains a challenge, because of the shortage of the effective synthesis methods and optimal building blocks. To date, all vinylene-bridged COFs synthesized by solvothermal method at high temperatures and pressures are insoluble and unprocessable powders, which lead to a formidable challenge in fabricating thin film-based electronic and optoelectronic devices. By using a liquid–liquid interface polymerization strategy, a vinylene-bridged COF film with a complete sp2-carbon skeleton has been successfully synthesized for the first time at room temperature. The COF nanospheres initially formed at the liquid–liquid interface slowly transmuted themselves into self-standing COF thin films with long-range ordered arrangement by covalent self-assembly. The as-fabricated electronic device with a configuration of Al/COFs/ITO exhibited a nonvolatile rewritable memory effect with a low switching-on voltage of +0.84 V. Associated with its bistable switching performance, this device is capable of executing simple “OR” logic operations.
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DOI: 10.1021/acsmaterialslett.2c01047
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