title: Vertically stacked multi-heterostructures of layered materials for logic transistors and complementary inverters.
abstract: Graphene has attracted considerable interest for future electronics, but the absence of a bandgap limits its direct applicability in transistors and logic devices. Recently, other layered materials such as molybdenum disulphide (MoS(2)) have been investigated to address this challenge. Here, we report the vertical integration of multi-heterostructures of layered materials for the fabrication of a new generation of vertical field-effect transistors (VFETs) with a room temperature on-off ratio > 10(3) and a high current density of up to 5,000 A cm(-2). An n-channel VFET is created by sandwiching few-layer MoS(2) as the semiconducting channel between a monolayer graphene sheet and a metal thin film. This approach offers a general strategy for the vertical integration of p- and n-channel transistors for high-performance logic applications. As an example, we demonstrate a complementary inverter with a larger-than-unity voltage gain by vertically stacking graphene, Bi(2)Sr(2)Co(2)O(8) (p-channel), graphene, MoS(2) (n-channel) and a metal thin film in sequence. The ability to simultaneously achieve a high on-off ratio, a high current density and a logic function in such vertically stacked multi-heterostructures can open up possibilities for three-dimensional integration in future electronics.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.
authors.forename: Woo Jong
authors.initials: WJ
authors.lastname: Yu
authors.forename: Zheng
authors.initials: Z
authors.lastname: Li
authors.forename: Hailong
authors.initials: H
authors.lastname: Zhou
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
mesh_terms: D004220:Disulfides / Q000737:chemistry; D004566:Electrodes; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D006108:Graphite / Q000737:chemistry; D008128:Logic; D008982:Molybdenum / Q000737:chemistry; D014173:Transistors, Electronic
chemical_list: D004220:Disulfides; D006108:Graphite; D008982:Molybdenum; C082964:molybdenum disulfide