title: Direct Observation of a Carbon Filament in Water-Resistant Organic Memory.
abstract: The memory for the Internet of Things (IoT) requires versatile characteristics such as flexibility, wearability, and stability in outdoor environments. Resistive random access memory (RRAM) to harness a simple structure and organic material with good flexibility can be an attractive candidate for IoT memory. However, its solution-oriented process and unclear switching mechanism are critical problems. Here we demonstrate iCVD polymer-intercalated RRAM (i-RRAM). i-RRAM exhibits robust flexibility and versatile wearability on any substrate. Stable operation of i-RRAM, even in water, is demonstrated, which is the first experimental presentation of water-resistant organic memory without any waterproof protection package. Moreover, the direct observation of a carbon filament is also reported for the first time using transmission electron microscopy, which puts an end to the controversy surrounding the switching mechanism. Therefore, reproducibility is feasible through comprehensive modeling. Furthermore, a carbon filament is superior to a metal filament in terms of the design window and selection of the electrode material. These results suggest an alternative to solve the critical issues of organic RRAM and an optimized memory type suitable for the IoT era.
authors.affiliation: ‡Department of Memory Business, Samsung Electronics, San #16 Banwol-Dong, Hwasung-City, Gyeonggi-Do 445-701, Republic of Korea.
authors.forename: Byung-Hyun
authors.initials: BH
authors.lastname: Lee
authors.forename: Hagyoul
authors.initials: H
authors.lastname: Bae
authors.affiliation: ∥Graphene Research Center, KI for Nanocentury, KAIST, Daejeon, 305-701, Republic of Korea.
authors.forename: Hyejeong
authors.initials: H
authors.lastname: Seong
authors.forename: Dong-Il
authors.initials: DI
authors.lastname: Lee
authors.forename: Hongkeun
authors.initials: H
authors.lastname: Park
authors.forename: Young Joo
authors.initials: YJ
authors.lastname: Choi
authors.affiliation: ∥Graphene Research Center, KI for Nanocentury, KAIST, Daejeon, 305-701, Republic of Korea.
authors.forename: Sung-Gap
authors.initials: SG
authors.lastname: Im
authors.forename: Sang Ouk
authors.initials: SO
authors.lastname: Kim
authors.forename: Yang-Kyu
authors.initials: YK
authors.lastname: Choi
keywords: carbon filament; flexible memory; initiated chemical vapor deposition (iCVD); organic resistive memory; thin nanofilm; water-resistant memory