Designing Organic Spin-Gapless Semiconductors via Molecular Adsorption on C 4 N 3 Monolayer
Spin-gapless semiconductor (SGS), a class of zero-gap materials with fully spin-polarized electrons and holes, offers significant potential for high-speed, low-energy consumption applications in spintronics, electronics, and optoelectronics. Our first-principles calculations revealed that the Pca21...
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Published in | Molecules (Basel, Switzerland) Vol. 29; no. 13 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
01.07.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Spin-gapless semiconductor (SGS), a class of zero-gap materials with fully spin-polarized electrons and holes, offers significant potential for high-speed, low-energy consumption applications in spintronics, electronics, and optoelectronics. Our first-principles calculations revealed that the Pca21 C
N
monolayer exhibits a ferromagnetic ground state. Its band structure displays SGS-like characteristics, with the energy gap between the valence and conduction bands near the Fermi level in the spin-down channel much smaller than the one in the other spin channel. To enhance its SGS properties, we introduced electrons into the Pca21 C
N
monolayer by adsorbing the CO gas molecule on its surface. Stable gas adsorption (CO@C
N
) effectively narrowed the band gap in the spin-down channel without changing the band gap in the spin-up channel obviously. Moreover, injecting holes into the CO@C
N
system could increase the net magnetic moments and induce an SGS-to-metallic phase transition, while injecting electrons into the CO@C
N
system is able to lower the net magnetic moments and cause an SGS-to-half-metallic phase transition. Our findings not only underscore a new promising material for practical metal-free spintronics applications but also illustrate a viable pathway for designing SGSs. |
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ISSN: | 1420-3049 |