Department of Information Display Engineering, Hanyang University, Seoul, Korea.
Nano Lett. 2010 Jul 14;10(7):2441-7. doi: 10.1021/nl1006036.
The electrical properties of flexible nonvolatile organic bistable devices (OBDs) fabricated with graphene sandwiched between two insulating poly(methyl methacrylate) (PMMA) polymer layers were investigated. Current-voltage (I-V) measurements on the Al/PMMA/graphene/PMMA/indium-tin-oxide/poly(ethylene terephthalate) devices at 300 K showed a current bistability due to the existence of the graphene, indicative of charge storage in the graphene. The maximum ON/OFF ratio of the current bistability for the fabricated OBDs was as large as 1 x 10(7), and the endurance number of ON/OFF switchings was 1.5 x 10(5) cycles, and an ON/OFF ratio of 4.4 x 10(6) was maintained for retention times larger than 1 x 10(5) s. No interference effect was observed for the scaled-down OBDs containing a graphene layer. The memory characteristics of the OBDs maintained similar device efficiencies after bending and were stable during repetitive bendings of the OBDs. The mechanisms for these characteristics of the fabricated OBDs are described on the basis of the I-V results.
采用双层聚甲基丙烯酸甲酯（PMMA）聚合物夹中间层石墨烯的柔性非易失性有机双稳器件（OBD）的电学性能得到了研究。在 300 K 下对 Al/PMMA/石墨烯/PMMA/铟锡氧化物/聚对苯二甲酸乙二醇酯器件进行电流-电压（I-V）测量，由于石墨烯的存在，显示出电流双稳性，表明石墨烯中存在电荷存储。所制备的 OBD 的电流双稳性的最大开/关比高达 1 x 10(7)，开/关开关的耐久性次数为 1.5 x 10(5)个循环，并且在大于 1 x 10(5) s 的保留时间内保持 4.4 x 10(6)的开/关比。含有石墨烯层的缩小版 OBD 没有观察到干扰效应。OBD 的存储特性在弯曲后保持类似的器件效率，并在 OBD 的重复弯曲过程中保持稳定。基于 I-V 结果描述了所制备的 OBD 的这些特性的机制。
