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Tunable Carrier Type and Density in Graphene/PbZr 0.2 Ti 0.8 O 3 Hybrid Structures through Ferroelectric Switching

2013; American Chemical Society; Volume: 13; Issue: 4 Linguagem: Inglês

10.1021/nl4002052

1530-6992

Christoph Baeumer, Steven P. Rogers, Ruijuan Xu, Lane W. Martin, Moonsub Shim,

Graphene research and applications

Bidirectional interdependency between graphene doping level and ferroelectric polarization is demonstrated in graphene/PbZr0.2Ti0.8O3 hybrid structures. The polarization of the PbZr0.2Ti0.8O3 can be effectively switched with graphene electrodes and can in turn alter carrier type and density in the graphene. A complete reversal of the current–voltage hysteresis direction is observed in the graphene when external environmental factors are minimized, converting p-type graphene into n-type with an estimated carrier density change as large as ∼1013 cm–2. Nonvolatility and reversibility are also demonstrated.