Fully Atomistic Simulations of Phonon-Limited Mobility of Electrons and Holes in \langle \hbox\rangle-, \langle \hbox\rangle-, and \langle \hbox\rangle -Oriented Si Nanowires

Phonon-limited mobilities of electrons and holes in Si nanowires (NWs) with 〈001〉, 〈110〉, and 〈111〉 orientations are calculated in a fully atomistic framework for diameters up to 10 nm. Electron-phonon scattering rates are computed with an sp 3 d 5 s* tight-binding model for electrons and a valence-...

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Published inIEEE transactions on electron devices Vol. 59; no. 5; pp. 1480 - 1487
Main Authors Niquet, Y-M, Delerue, C., Rideau, D., Videau, B.
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2012
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Abstract Phonon-limited mobilities of electrons and holes in Si nanowires (NWs) with 〈001〉, 〈110〉, and 〈111〉 orientations are calculated in a fully atomistic framework for diameters up to 10 nm. Electron-phonon scattering rates are computed with an sp 3 d 5 s* tight-binding model for electrons and a valence-force field model for phonons. The Boltzmann equation is then solved exactly for the low-field mobility. Compared to bulk Si, the electron mobilities are strongly reduced, but the hole mobilities can be enhanced in 〈111〉 and 〈110〉 NWs with diameters around 3.5 nm. The mobility, however, rapidly decreases with carrier concentration >; 10 19 cm -3 .
AbstractList Phonon-limited mobilities of electrons and holes in Si nanowires (NWs) with 〈001〉, 〈110〉, and 〈111〉 orientations are calculated in a fully atomistic framework for diameters up to 10 nm. Electron-phonon scattering rates are computed with an sp 3 d 5 s* tight-binding model for electrons and a valence-force field model for phonons. The Boltzmann equation is then solved exactly for the low-field mobility. Compared to bulk Si, the electron mobilities are strongly reduced, but the hole mobilities can be enhanced in 〈111〉 and 〈110〉 NWs with diameters around 3.5 nm. The mobility, however, rapidly decreases with carrier concentration >; 10 19 cm -3 .
Author Niquet, Y-M
Delerue, C.
Videau, B.
Rideau, D.
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Snippet Phonon-limited mobilities of electrons and holes in Si nanowires (NWs) with 〈001〉, 〈110〉, and 〈111〉 orientations are calculated in a fully atomistic framework...
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StartPage 1480
SubjectTerms Effective mass
Electron mobility
Electron-phonon scattering
Logic gates
mobility
nanowire (NW)
Phonons
Scattering
Silicon
simulation
tight binding (TB)
valence-force field
Title Fully Atomistic Simulations of Phonon-Limited Mobility of Electrons and Holes in \langle \hbox\rangle-, \langle \hbox\rangle-, and \langle \hbox\rangle -Oriented Si Nanowires
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