Monolayer optical memory cells based on artificial trap-mediated charge storage and release.
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ABSTRACT: Monolayer transition metal dichalcogenides are considered to be promising candidates for flexible and transparent optoelectronics applications due to their direct bandgap and strong light-matter interactions. Although several monolayer-based photodetectors have been demonstrated, single-layered optical memory devices suitable for high-quality image sensing have received little attention. Here we report a concept for monolayer MoS2 optoelectronic memory devices using artificially-structured charge trap layers through the functionalization of the monolayer/dielectric interfaces, leading to localized electronic states that serve as a basis for electrically-induced charge trapping and optically-mediated charge release. Our devices exhibit excellent photo-responsive memory characteristics with a large linear dynamic range of ?4,700 (73.4?dB) coupled with a low OFF-state current (<4?pA), and a long storage lifetime of over 104?s. In addition, the multi-level detection of up to 8 optical states is successfully demonstrated. These results represent a significant step toward the development of future monolayer optoelectronic memory devices.
SUBMITTER: Lee J
PROVIDER: S-EPMC5376667 | biostudies-literature | 2017 Mar
REPOSITORIES: biostudies-literature
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