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Cited by 4,442

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High-mobility transport anisotropy and linear dichroism in few-layer black phosphorus

Open access
Qiao, Jingsi, Kong, Xianghua, Hu, Zhi-Xin, Yang, Feng, Ji, Wei·2014·Nature Communications

Abstract

Two-dimensional crystals are emerging materials for nanoelectronics. Development of the field requires candidate systems with both a high carrier mobility and, in contrast to graphene, a sufficiently large electronic bandgap. Here we present a detailed theoretical investigation of the atomic and electronic structure of few-layer black phosphorus (BP) to predict its electrical and optical properties. This system has a direct bandgap, tunable from 1.51 eV for a monolayer to 0.59 eV for a five-layer sample. We predict that the mobilities are hole-dominated, rather high and highly anisotropic. The monolayer is exceptional in having an extremely high hole mobility (of order 10,000 cm2 V−1 s−1) and anomalous elastic properties which reverse the anisotropy. Light absorption spectra indicate linear dichroism between perpendicular in-plane directions, which allows optical determination of the crystalline orientation and optical activation of the anisotropic transport properties. These results make few-layer BP a promising candidate for future electronics. Two-dimensional (2D) materials with a large electronic bandgap in addition to high carrier mobility are required for future nanoelectronics. Here, the authors present a theoretical investigation of black phosphorous, a new category of 2D semiconductor with high potential for nanoelectronic applications.

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Metadata

Authors
Qiao, J., Kong, X., Hu, Z.-X., Yang, F., & Ji, W.
Venue
Nature Communications
Published
2014-07-21
Volume
5
Issue
1
Pages
4475-4475
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2029281675
Cited by
4,442
References
50
FWCI
162.46
Type
journal article
Language
en
Open access
hybrid

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