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EnglishThe low-field channel mobility of graphene nanoribbon (GNR) FETs is investigated through an atomistic full-quantum numerical model including elastic acoustic phonon (AP) scattering and edge roughness (ER), the latter being treated via a direct statistical approach. We find that, for narrow GNRs (W = 1 ÷ 2 nm), quantum localization effects due to ER become important, so that it is not possible to define an ER limited mobility. In this regime, the inclusion of AP scattering results in a current increase rather than decrease, due to phase breaking, which partially recovers the ohmic regime. The resulting total mobility extracted from a long channel GNR-FET biased in the ON-state is not far from the measured mobility of a GNR of comparable dimensions.
| Titolo: | Full-Quantum Calculations of Low-Field Channel Mobility in Graphene Nanoribbon FETs Including Acoustic Phonon Scattering and Edge Roughness Effects |
| Autore/i: | IMPERIALE, ILARIA; GRASSI, ROBERTO; GNUDI, ANTONIO; REGGIANI, SUSANNA; GNANI, ELENA; BACCARANI, GIORGIO |
| Autore/i Unibo: | |
| Anno: | 2010 |
| Titolo del libro: | Proc. of the 11th International Conference on Ultimate Integration on Silicon |
| Pagina iniziale: | 57 |
| Pagina finale: | 60 |
| Abstract: | The low-field channel mobility of graphene nanoribbon (GNR) FETs is investigated through an atomistic full-quantum numerical model including elastic acoustic phonon (AP) scattering and edge roughness (ER), the latter being treated via a direct statistical approach. We find that, for narrow GNRs (W = 1 ÷ 2 nm), quantum localization effects due to ER become important, so that it is not possible to define an ER limited mobility. In this regime, the inclusion of AP scattering results in a current increase rather than decrease, due to phase breaking, which partially recovers the ohmic regime. The resulting total mobility extracted from a long channel GNR-FET biased in the ON-state is not far from the measured mobility of a GNR of comparable dimensions. |
| Data prodotto definitivo in UGOV: | 25-gen-2011 |
| Appare nelle tipologie: | 4.01 Contributo in Atti di convegno |
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