Abstract
In this paper, we analyzed the ultrafast transient transport in n-doped ZnS in wurtzite and zincblende phases, driven far away from equilibrium by an electric field. Through the numerical solution of associate quantum transport equations based on the Non-Equilibrium Statistical Operator Method, the time evolution of the electron drift velocity and the non-equilibrium temperature of electrons and phonons were obtained, analyzing the dependence on the electric field strength.
Highlights
Zinc sulfide (ZnS) is a wide band-gap semiconductor, which crystallizes in zincblende (ZB) or wurtzite (WZ) phases
It can be noticed that the larger electron drift velocity corresponds to ZnS(WZ), which can be ascribed to the fact that the electrons have a smaller effective mass in ZnS(WZ) than in ZnS(ZB)
The electron drift velocity is proportional to the relaxation time, which is composed of the contributions due to scattering by phonons and by impurities
Summary
Zinc sulfide (ZnS) is a wide band-gap semiconductor, which crystallizes in zincblende (ZB) or wurtzite (WZ) phases. We have witnessed a large expansion in the study of the wide-gap and strongly-polar semiconductors This is a consequence of the realization of the long-awaited possibility of growing satisfactory samples, leading to the increased development of electronic and opto-electronic devices of large technological and industrial interest (blue diodes, blue lasers, etc.) [1,2,3,4,5,6]. We used a kinetic theory for far-from equilibrium systems: the “Non-Equilibrium Statistical Operator Method” [15], which provides an elegant, practical, and physically clear picture of irreversible processes [16,17]; for example, in far-from equilibrium semiconductors [18,19,20,21,22], which is the case considered here This method was used in numerous works for studying transport processes and kinetic phenomena (e.g., [23,24,25]). Through the numerical solution of associate quantum transport equations based on the Non-Equilibrium Statistical Operator Method, the time evolution of the electron drift velocity, and the non-equilibrium temperature of electrons and phonons (optical and acoustic) were obtained in n-doped zinc sulfide, in wurtzite and zincblende phases, analyzing the dependence on the electric field strength
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