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Theoretical Predictions of Size-Dependent Carrier Mobility and Polarity in Graphene

First-principles density functional theory coupled with deformation potential calculations indicate a strong width-dependent carrier mobility: for an armchair graphene ribbon whose width (i.e., number of carbons along the edge) is N = 3k, the room-temperature electron mobility is calculated to be ∼1...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2009-12, Vol.131 (49), p.17728-17729
Main Authors: Long, Meng-Qiu, Tang, Ling, Wang, Dong, Wang, Linjun, Shuai, Zhigang
Format: Article
Language:English
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Summary:First-principles density functional theory coupled with deformation potential calculations indicate a strong width-dependent carrier mobility: for an armchair graphene ribbon whose width (i.e., number of carbons along the edge) is N = 3k, the room-temperature electron mobility is calculated to be ∼106 cm2 V−1 s−1 and the hole mobility ∼104 cm2 V−1 s−1, while for N = 3k + 1 or 3k + 2, the hole mobility is calculated to be 4−8 × 105 cm2 V−1 s−1 and the electron mobility ∼104 cm2 V−1 s−1. Such alternating behavior is absent in zigzag-type graphene.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja907528a