Carrier Transport in Graphene Field-Effect Transistors on Gated Polar Nitride Substrates

Balasubramanian, K and Chandrasekar, H and Raghavan, S (2020) Carrier Transport in Graphene Field-Effect Transistors on Gated Polar Nitride Substrates. In: Physica Status Solidi (A) Applications and Materials Science, 217 (16).

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Abstract

Large-area, complementary metal�oxide semiconductor-compatible substrates for high-performance graphene-based electronic devices are desired and AlN is a promising candidate with high dielectric constant and low surface phonon densities. An informed choice of substrate needs to consider the simultaneous effects of the two major substrate-induced scattering mechanisms�remote impurity scattering and remote interfacial phonon scattering. Herein, the effects of such an interplay with fundamentally different electron and hole transport characteristics in chemical vapor deposition (CVD)-grown monolayer graphene field-effect transistors (FETs) on AlN thin films are demonstrated, due to the polar and piezoelectric nature of AlN. Temperature-dependent measurements not only reveal a cross-over in mobility, with graphene FETs on AlN having larger mobilities than SiO2 at higher temperatures, but also an asymmetry between the cross-over temperature for the electron and hole branches. Theoretical transport model using appropriate densities of charged impurities in both cases is shown to match well with the experimental results. These results highlight the role of the actual charge configurations within thin-film dielectric substrates on carrier transport in practically realizable graphene FETs, which can be further generalized to other 2D material systems. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Publication:	Physica Status Solidi (A) Applications and Materials Science
Publisher:	Wiley-VCH Verlag
Keywords:	Aluminum nitride; Chemical vapor deposition; Field effect transistors; Graphene; Graphene transistors; Hole mobility; III-V semiconductors; Monolayers; Oxide semiconductors; Phonons; Silica; Thin film circuits; Thin films; Wide band gap semiconductors, Charge configuration; Chemical vapor depositions (CVD); Graphene field-effect transistors; High dielectric constants; Scattering mechanisms; Simultaneous effects; Temperature-dependent measurements; Thin-film dielectrics, Substrates
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	05 Nov 2021 05:52
Last Modified:	05 Nov 2021 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/65770

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