Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 2, Pages 676-685Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03829
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Funding
- National Natural Science Foundation of China [21905159, 11974208]
- Natural Science Foundation of Shandong Province [ZR2019BA010, ZR2019MA054, 2019KJJ020, ZR2020YQ05]
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Researchers have reported a new type of two-dimensional graphene material with good stability and high Fermi velocities. Some of the monolayers exhibit a pristine n-type self-doping Dirac cone structure, while the ClPSi3 monolayer is found to be potential excellent strain sensor.
The pristine semimetal property of two-dimensional (2D) Dirac materials has limited their practical applications in today's electronic devices. Here we report a new type of 2D Dirac material, termed ABX(3) (A = F, Cl, Br, or I; B = P or As; X = C or Si) monolayers. We demonstrate that 14 ABX(3) monolayers possess good stability and high Fermi velocities. The FPC3, ClPC3, BrPC3, and FAsC3 monolayers exhibit a pristine n-type self-doping Dirac cone due to the interactions of electrons between the A-B units and C-6 rings, which is beneficial for realizing high-speed carriers. Interestingly, the ClPSi3 monolayer exhibits remarkable responses to strain because a self-doping Dirac cone can be induced by relatively small in-plane biaxial strains (-5%), and the current-voltage (I-V) curves verified that the response strength is 11.57 times that of the graphene-based strain sensor at a bias of 1.10 V, indicating that the ClPSi3 monolayer could be used as a potential excellent strain sensor.
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