Модифіковані Графеноподібні Плівки Як Новий Клас Напівпровідників Зі Змінною Шириною Забороненої Зони

The new carbon allotropes “between diamond and graphite” have come under intensive examination during the last decade due to their numerous technical applications. The modification of energy gap in thin films of these allotropes was studied experimentally using optical methods. The proposed simple model of carbon clusters with variable lengths of chemical bonds allows us to imitate the transfer from diamond and diamond-like to graphite-like structures, as well as the corresponding modification of hybridization sp3/sp2 for diamond-like and spz for graphite-like phases. This enables us to estimate various allotropes parameters, like the gap Eg, energies of valence Ev, and conduction Ec band edges, and the value of electronic affinity, i.e., optical work function X, which are all of practical importance. The obtained estimations correspond to the experimental data.

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Ferroelectric domain triggers the charge modulation in semiconductors (invited)

Morozovska

Eliseev

Ievlev

et al. 2014

Journal of Applied Physics

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We consider a typical heterostructure "domain patterned ferroelectric film − ultra-thin dielectric layer − semiconductor", where the semiconductor can be an electrolyte, paraelectric or multi-layered graphene.Unexpectedly we have found that the space charge modulation profile and amplitude in the semiconductor, that screens the spontaneous polarization of a 180-degree domain structure of ferroelectric, depends on the domain structure period, dielectric layer thickness and semiconductor screening radius in a rather non-trivial nonlinear way. Multiple size effects appearance and manifestation are defined by the relationship between these three parameters. In addition, we show that the concept of effective gap can be introduced in a simple way only for a single-domain limit. Obtained analytical results open the way for understanding of current-AFM maps of contaminated ferroelectric surfaces in ambient atmosphere as well as explore the possibilities of conductivity control in ultra-thin semiconductor layers.

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Модифіковані Графеноподібні Плівки Як Новий Клас Напівпровідників Зі Змінною Шириною Забороненої Зони

Cited by 5 publications

References 15 publications

Influence of Optical Illumination on the Electric Impedance of Composite Nanostructures Based on p-GaSe Layered Semiconductor with 3D Nanodimensional Inclusions of KNO3 Ferroelectric

Influence of Optical Illumination on the Electric Impedance of Composite Nanostructures Based on p-GaSe Layered Semiconductor with 3D Nanodimensional Inclusions of KNO3 Ferroelectric

The semi-empirical tight-binding model for carbon allotropes “between diamond and graphite”

Ferroelectric domain triggers the charge modulation in semiconductors (invited)

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