Jo-Won Lee

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Graphene was grown on (0001) quartz substrate (z-cut) using catalyst free Chemical Vapor Deposition (CVD). Methane was used as a carbon source and hydrogen was introduced independently to optimize the growth. The effect of growth temperature was investigated while varying the temperature between 1000 and 1300 degrees C. With an optimized condition, a thin(More)
This experiment is the first exploration of use of charge traps in the bulk of deposited top oxide and at the interface between thermal oxide and deposited top oxide. We report the operational characteristics of SiO2/SiO2 device structures with 0.5 microm gate width and length. Low power operations are achieved through very thin gate stacks of 3 nm of(More)
We report a fast single element nonvolatile memory that employs amorphous to crystalline phase change. Temperature change is induced within a single electronic element in confined geometry transistors to cause the phase change. This novel phase change memory (PCM) operates without the need for charge transport through insulator films for charge storage in a(More)
We have explored the properties of SiC-based epitaxial graphene grown in a cold wall UHV chamber. The effects of the SiC surface orientation and silicon loss rate were investigated by comparing the characteristics of each formed graphene. Graphene was grown by thermal decomposition on both the silicon (0001) and carbon (000-1) faces of on-axis(More)
The effects of treatment with polyvinyl alcohol (PVA) and a dielectric film of HfO(2) on the properties of SiC based epitaxial graphene have been explored and analyzed. We have characterized the carrier mobility of graphene on Si-face and C-face SiC with a layer of HfO(2), with or without an initial PVA treatment on the device active layer. Epitaxial(More)
Graphene has several unique physical, optical and electrical properties such as a two-dimensional (2D) planar structure, high optical transparency and high carrier mobility at room temperature. These make graphene interesting for electrical biosensing. Using a catalyst-free chemical vapor deposition (CVD) method, graphene film is grown on a sapphire(More)
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