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Issue 3, 2019
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TlP5: an unexplored direct band gap 2D semiconductor with ultra-high carrier mobility

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Abstract

Two-dimensional materials with an appropriate band gap and high carrier mobility are urgently desired in the field of nanoelectronics. We propose a novel two-dimensional crystal monolayer TlP5, which is dynamically and thermodynamically stable and possesses a direct band gap of 2.02 eV with high carrier mobilities (13 960 cm2 V−1 s−1 for electrons and 7560 cm2 V−1 s−1 for holes), comparable to that of phosphorene. The band gap value and band characteristics of monolayer TlP5 can be adjusted by biaxial and uniaxial strains, and excellent optical absorption over the visible-light range is predicted. These properties, especially the balanced high mobilities for not only the electrons but also the holes, make monolayer TlP5 an exciting functional material for future applications in nanoelectronics and optoelectronics.

Graphical abstract: TlP5: an unexplored direct band gap 2D semiconductor with ultra-high carrier mobility

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Article information


Submitted
12 Oct 2018
Accepted
11 Dec 2018
First published
11 Dec 2018

J. Mater. Chem. C, 2019,7, 639-644
Article type
Paper

TlP5: an unexplored direct band gap 2D semiconductor with ultra-high carrier mobility

J. Yuan, A. Cresti, K. Xue, Y. Song, H. Su, L. Li, N. Miao, Z. Sun, J. Wang and X. Miao, J. Mater. Chem. C, 2019, 7, 639
DOI: 10.1039/C8TC05164J

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