Application of graphene vertical field effect to regulation of organic light-emitting transistors |
(a) Frequency dependence of specific capacitance of ion–gel spin-coated on ITO glass; schematic diagrams of charge layer distribution: (b) anions are dispersed in dielectric layer; (c) anions are dispersed under negative gate voltage, with holes accumulating in graphene; (d) anions are dispersed under positive gate voltage, with electrons accumulating in grapheme. |