Abstract
We report on our progress and development of high speed flexible graphene field effect transistors (GFETs) with high electron and hole mobilities (~3000 cm2/V·s), and intrinsic transit frequency in the microwave GHz regime. We also describe the design and fabrication of flexible graphene based radio frequency system. This RF communication system consists of graphite patch antenna at 2.4 GHz, graphene based frequency translation block (frequency doubler and AM demodulator) and graphene speaker. The communication blocks are utilized to demonstrate graphene based amplitude modulated (AM) radio receiver operating at 2.4 GHz.
Highlights
Research efforts in the field of flexible GHz nanoelectronics have been gaining significant momentum recently
In this paper we present the state of the art flexible graphene field effect transistors (GFET) with high intrinsic fT of 18 GHz that has recently been improved to 100 GHz [14]
Where Ydut to obtain the intrinsic GFET performance (YGFET) is the Y-parameters of the intrinsic GFET, Ydut is the Y-parameter of DUT (Extrinsic GFET), Yshort is the Y-parameter of the DUT with gate, drain and source shorted, Yopen is the DUT with no graphene channel
Summary
Research efforts in the field of flexible GHz nanoelectronics have been gaining significant momentum recently. Continuous advancements in the material synthesis of intrinsically flexible nanomaterials such as graphene, h-BN, carbon nano-tubes (CNTs) and transition metal dichalcogenides (TMDs, e.g., molybdenum disulfide—MoS2) [8,9] have encouraged their prospects for practical electronic application These materials are naturally more suitable for integration with flexible, soft or glass substrates owing to their two dimensional nature and can potentially offer the electronic performance needed for low-power GHz systems. Graphene is a single sheet of carbon with very high room temperature mobility (>10,000 cm2/V·s), high cutoff frequency (>300 GHz), and high electrical and thermal conductivity [2,3,10] These properties of graphene make it a suitable candidate for the design of high frequency analog communication circuits, such as amplifiers, mixers, demodulators, and speakers [11]. We discuss the design of individual graphene based radio frequency system blocks—flexible graphite patch antenna, graphene based frequency translation block (GFET doubler and demodulator), graphene speaker, and the demonstration of the first graphene based AM radio receiver
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