Band Structure Engineering of Interfacial Semiconductors Based on Atomically Thin Lead Iodide Crystals

Sun, Yan; Huang, Zhen; Zhou, Zishu; Wu, Jiang; Zhou, Liujiang; Yang, Cheng; Liu, Jinqiu; Zhu, Chao; Yu, Maotao; Yu, Peng; Zhu, Wei; Liu, Yue; Zhou, Jian; Liu, Bowen; Xie, Hongguang; Cao, Yi; Li, Hai; Wang, Xinran; Liu, Kaihui; Wang, Xiaoyong; Wang, Jianpu; Wang, Lin; Huang, Wei

doi:10.48550/arxiv.1810.08927

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“…They are most pronounced in ultrathin films with the thickness of several PbI2 layer packets (3)(4) in the case of shear vibrations phonon modes (Fig. 4 a) but several tens (50-100) in flexural (Fig.…”

Section: Velocity Spectrum Of Acoustic Phonons In the 2h-pbi2 Nanofilmmentioning

confidence: 97%

“…Despite the fact that the properties of lead iodide and nanostructures based on it have been studied for a long time the interest in them has not decreased today. This is due to the fact that the combination of unique properties of this layered semiconductor with unique properties of low-dimensional structures is a very promising direction in the design of new generations of electronic and electrooptical devices for a wide range of purposes [1][2][3][4]. The need to develop this area stimulated an in-depth study of peculiarities of physical processes in such structures.…”

Section: Introductionmentioning

confidence: 99%

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Frequency spectrum and group velocities of acoustic phonons in PbI2 nanofilms

Petryk

Lutsiuk

Kramar

2022

Phys. Chem. Solid St.

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Using the elastic continuum approach, an energy spectrum and spectral dependences of a group velocities of confined acoustic phonons in planar quasi-two-dimensional nanostructures (nanofilms) of hexagonal symmetry of the 2H-PbI2 type were studied by methods of the theory of elasticity. It is shown that the energy and propagation velocity of vibrational modes for all branches of the phonon spectrum in these type nanostructures are nonlinear functions of a magnitude of a wave vector and a thickness of the nanofilm. The obtained results can be used to analyze an influence of acoustic phonons on a course of phenomena of thermal and electrical conductivity, carrier scattering and optical absorption in nanostructures, components of which are thin layers of lead iodide.

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Section: Velocity Spectrum Of Acoustic Phonons In the 2h-pbi2 Nanofilmmentioning

confidence: 97%