Ji, Yongsung Kim, Juhan Cha, An-Na Lee, Sang-A Lee, Myung Woo Suh, Jung Sang Bae, Sukang Moon, Byung Joon Lee, Sang Hyun Lee, Dong Su Wang, Gunuk Kim, Tae-Wook 2024-01-20T04:31:44Z 2024-01-20T04:31:44Z 2021-09-04 2016-04-08 0957-4484 https://pubs.kist.re.kr/handle/201004/124176 A highly efficient solution-processible charge trapping medium is a prerequisite to developing high-performance organic nano-floating gate memory (NFGM) devices. Although several candidates for the charge trapping layer have been proposed for organic memory, a method for significantly increasing the density of stored charges in nanoscale layers remains a considerable challenge. Here, solution-processible graphene quantum dots (GQDs) were prepared by a modified thermal plasma jet method; the GQDs were mostly composed of carbon without any serious oxidation, which was confirmed by x-ray photoelectron spectroscopy. These GQDs have multiple energy levels because of their size distribution, and they can be effectively utilized as charge trapping media for organic NFGM applications. The NFGM device exhibited excellent reversible switching characteristics, with an on/off current ratio greater than 106, a stable retention time of 10(4) s and reliable cycling endurance over 100 cycles. In particular, we estimated that the GQDs layer trapped similar to 7.2 x 10(12) cm(-2) charges per unit area, which is a much higher density than those of other solution-processible nanomaterials, suggesting that the GQDs layer holds promise as a highly efficient nanoscale charge trapping material. English IOP PUBLISHING LTD TRANSISTOR DEVICES GRAPHITE VOLTAGE CARBON NANOPARTICLES SIZE Graphene quantum dots as a highly efficient solution-processed charge trapping medium for organic nano-floating gate memory Article 10.1088/0957-4484/27/14/145204 1 NANOTECHNOLOGY, v.27, no.14 NANOTECHNOLOGY 27 14 scie scopus 000371020700005 2-s2.0-84959520635 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article TRANSISTOR DEVICES GRAPHITE VOLTAGE CARBON NANOPARTICLES SIZE graphene quantum dots organic transistors memory