Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Graphene (jointly with DY, MA, HL, DS, O) (joint session TT/DY/HL)

HL 15.2: Vortrag

Montag, 16. März 2020, 15:15–15:30, HSZ 201

Graphene grain boundaries for strain sensing: a computational study — Delwin Perera and •Jochen Rohrer — Institut für Materialwissenschaft, Technische Universität Darmstadt, Germany

Graphene has been celebrated as a material with exceptional properties at various fronts of electronics. In this contribution we investigate the strain sensing capabilities of graphene containing grain boundaries by using the non-equilibrium Green function formalism. Our work is inspired by an enhanced piezoresistivity of nanocrystalline graphene found experimentally in 2015 [1]. We investigate how different structural realizations of the grain boundary impact the transport properties. In particular, we compute strain gauge factors solely from ab initio electronic structure calculations as a function of the grain boundary topology. Thereby, we can compare this popular figure of merit for strain gauges with experimental values.

[1] Riaz et al., Nanotechnology 26, 325202 (2015)