2D Monoelements. Группа авторов
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To highlight the main responsible of such a low lattice thermal conductivity in PO, one should examine the various phonon modes. The puckered structure of PO allows more phonon-phonon scattering of the ZA mode with a contribution of 15% to 17%, while the longitudinal and transverse acoustic modes are the most dominant ones. Furthermore, the lattice thermal conductivity in a material results on the use of different phonon scattering sources. For the case of PO, only the phonon-phonon scattering is considered, since the other sources, such as Umklapp scattering, phonon-electron scattering, impurity effect and boundary effect are so negligible. As shown in Figure 1.17, the anharmonic relaxation times of as a function of frequency indicates that the phonon lifetime corresponding to three acoustic modes (ZA, TA, and LA) and the other higher modes of PO is more lower than that of pure phosphorene. This reduction is mainly owing to dangling bond connecting oxygen atom to its phosphorous neighbor which allow to O not only in the optical P-O vibration, but also vibrate along the in-plane directions together with phosphorous atoms contributing to the acoustic modes. It follows that this contribution is responsible for the acoustic phonon softening which decreases the thermal conductivity of PO [87].
Figure 1.17 Mode-dependent anharmonic phonon relaxation time for acoustic modes.
1.4 Conclusion
In this chapter, we have presented an overview of pure phosphorene, its geometric structure, its physical properties, its fabrication methods, and several applications. We have also shown thatowing to its puckered structure and its strong anisotropic electronic, mechanical, magnetic, and optical properties, phosphorene constitutes an ideal candidate for potential applications, including gas sensor, field-effect transistor, and solar cell application. Unstable under atmospheric conditions, we have reported phosphorene oxides and demonstrated how O-functionalization is a promising technique to enhance the features of this novel material.
Acknowledgment
Lalla Btissam Drissi et al. thank “Académie Hassan II des Sciences et Techniques-Morocco” for financial support.
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