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

Jingsi Qiao, Xianghua Kong, Zhi-Xin Hu, Feng Yang and Wei Ji ()
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Jingsi Qiao: Renmin University of China
Xianghua Kong: Renmin University of China
Zhi-Xin Hu: Renmin University of China
Feng Yang: Renmin University of China
Wei Ji: Renmin University of China

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5475

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