Broadband Linear-Dichroic Photodetector in a Black Phosphorus Vertical p-n Junction

Abstract

The ability to detect light over a broad spectral range is central for practical optoelectronic applications, and has been successfully demonstrated with photodetectors of two-dimensional layered crystals such as graphene and MoS2. However, polarization sensitivity within such a photodetector remains elusive. Here we demonstrate a linear-dichroic broadband photodetector with layered black phosphorus transistors, using the strong intrinsic linear dichroism arising from the in-plane optical anisotropy with respect to the atom-buckled direction, which is polarization sensitive over a broad bandwidth from 400 nm to 3750 nm. Especially, a perpendicular build-in electric field induced by gating in black phosphorus transistors can spatially separate the photo-generated electrons and holes in the channel, effectively reducing their recombination rate, and thus enhancing the efficiency and performance for linear dichroism photodetection. This provides new functionality using anisotropic layered black phosphorus, thereby enabling novel optical and optoelectronic device applications.

arXiv comment18 pages, 5 figures in Nature Nanotechnology 2015

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• Why all the fuss about 2D semiconductors?
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• Pseudospin-selective Floquet band engineering in black phosphorus
• Electronics and optoelectronics of quasi-one dimensional layered transition metal trichalcogenides
• Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus
• Interlayer electronic hybridization leads to exceptional thickness-dependent vibrational properties in few-layer black phosphorus
• Determination of layer-dependent exciton binding energies in few-layer black phosphorus
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• Mechanical and liquid phase exfoliation of cylindrite: a natural van der Waals superlattice with intrinsic magnetic interactions
• Photodetecting and Light-Emitting Devices Based on Two Dimensional Materials
• Boundary conditions for phosphorene nanoribbons in the continuum approach
• Visualizing Orbital Content of Electronic Bands in Anisotropic 2D Semiconducting ReSe${}_2$
• Temperature dependent anisotropic charge carrier mobility limited by ionized impurity scattering in thin-layer black phosphorus
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• Mid-wave and Long-wave IR Linear Dichroism in a Hexagonal Perovskite Chalcogenide
• Tuning the electronic properties of gated multilayer phosphorene: A self-consistent tight-binding study
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• Optical-based thickness measurement of MoO${}_3$ nanosheets
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• Optical Properties of Anisotropic Excitons in Phosphorene
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