Work

The role of band-tail states on the electric properties of amorphous chalcogenides: A simulative approach

Year: 2024

Type: article

Abstract: Band-tail states, i.e., charge-carrier energy states located in the bandgap at the valence and conduction band edges of amorphous materials, even though not delocalized, exhibit nonzero mobility; thus, they are expected to contribute to the charge-conduction process. A microscopic model based on hydrodynamic transport equations for unipolar conduction, including trap, band-tail, and band states, and coupled to the Poisson equation is presented here. The equations are self-consistently solved by means of a numerical procedure, and the results provide qualitative and quantitative estimates of the influence of band-tail states (namely, of their energy distribution, density, and mobility) on the carrier heating, precursor of the Ovonic threshold switch.

Source: Journal of Applied Physics

DOI: 10.1063/5.0220117

Authors: R. Brunetti, C. Jacoboni, M. Rudan

Institutions: University of Modena and Reggio Emilia, University of Bologna

Language: English

Topic: Phase-change materials and chalcogenides

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500

Funders: Consiglio Nazionale delle Ricerche, Istituto Nanoscienze, Consiglio Nazionale delle Ricerche