Department of Electrical Engineering, University of Hawai'i at Manoa, Honolulu, HI 96822, USA.
Space and Naval Warfare Systems Command of the Pacific, Pearl City, HI 96782, USA.
Sensors (Basel). 2018 Aug 23;18(9):2774. doi: 10.3390/s18092774.
We have pioneered the use of liquid polar organic molecules as alternatives to rigid gate-dielectrics for the fabrication of graphene field-effect transistors. The unique high net dipole moment of various polar organic molecules allows for easy manipulation of graphene's conductivity due to the formation of an electrical double layer with a high-capacitance at the liquid and graphene interface. Here, we compare the performances of dimethyl sulfoxide (DMSO), acetonitrile, propionamide, and valeramide as polar organic liquid dielectrics in graphene field-effect transistors (GFETs). We demonstrate improved performance for a GFET with a liquid dielectric comprised of DMSO with high electron and hole mobilities of 154.0 cm²/Vs and 154.6 cm²/Vs, respectively, and a Dirac voltage <5 V.
我们率先使用液态极性有机分子作为制造石墨烯场效应晶体管的刚性栅介质替代品。由于在液体和石墨烯界面形成具有高电容的双电层，各种极性有机分子的独特高净偶极矩使得很容易操纵石墨烯的电导率。在这里，我们比较了二甲基亚砜（DMSO）、乙腈、丙酰胺和缬酰胺作为极性有机液体电介质在石墨烯场效应晶体管（GFET）中的性能。我们证明了由具有高电子和空穴迁移率（分别为 154.0 cm²/Vs 和 154.6 cm²/Vs）和<5 V 狄拉克电压的 DMSO 组成的液体介电体的 GFET 具有改善的性能。
