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Title: Amorphous two-dimensional black phosphorus with exceptional photocarrier transport properties
Authors: Bellus, MZ
Yang, ZB 
Hao, JH 
Lau, SP 
Zhao, H
Issue Date: Jun-2017
Source: 2d materials, June 2017, v. 4, no. 2, 025063
Abstract: Recently, two-dimensional materials have been extensively studied. Due to the reduced dielectric screening and confinement of electrons in two dimensions, these materials show dramatically different electronic and optical properties from their bulk counterparts. So far, studies on two-dimensional materials have mainly focused on crystalline materials. Here we report studies of atomically thin amorphous black phosphorus, as the first two-dimensional amorphous material. Spatially and temporally resolved pump-probe measurements show that large-area and uniform atomic layers of amorphous black phosphorus, synthesized at low temperature, possess a long exciton lifetime of about 400 ps, a room-temperature exciton diffusion coefficient of 5 cm(2) s(-1), which is at least two orders of magnitude larger than amorphous silicon, and an exciton mobility of about 200 cm(2) V-1 s(-1). We also deduce from these values an exciton mean free time of 50 fs, a mean free path of 5 nm, and a diffusion length of 450 nm. These results suggest that amorphous black phosphorus can be potentially used in low-cost optoelectronic devices.
Keywords: Black phosphorus
Amorphous
Photocarrier
Diffusion
Mobility
Publisher: Institute of Physics Publishing
Journal: 2d materials 
ISSN: 2053-1583
DOI: 10.1088/2053-1583/aa676f
Rights: © 2017 IOP Publishing Ltd
This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/)
The following publication Bellus, M. Z., Yang, Z., Hao, J., Lau, S. P., & Zhao, H. (2017). Amorphous two-dimensional black phosphorus with exceptional photocarrier transport properties. 2D Materials, 4(2), 025063 is available at https://doi.org/10.1088/2053-1583/aa676f.
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