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Contributions of point defects, chemical disorder, and thermal vibrations to electronic properties of Cd1-xZnxTe alloys

D. Aberg ; Paul Erhart (Institutionen för teknisk fysik, Material- och ytteori) ; V. Lordi
Physical Review B (1098-0121). Vol. 88 (2013), 4, p. 045201.
[Artikel, refereegranskad vetenskaplig]

We present a first-principles study based on density functional theory of thermodynamic and electronic properties of the most important intrinsic defects in the semiconductor alloy Cd1-xZnxTe with x < 0.13. The alloy is represented by a set of supercells with disorder on the Cd/Zn sublattice. Defect formation energies as well as electronic and optical transition levels are analyzed as a function of composition. We show that defect formation energies increase with Zn content with the exception of the neutral Te vacancy. This behavior is qualitatively similar to but quantitatively rather different from the effect of volumetric strain on defect properties in pure CdTe. Finally, the relative carrier scattering strengths of point defects, alloy disorder, and phonons are obtained. It is demonstrated that for realistic defect concentrations, carrier mobilities are limited by phonon scattering for temperatures above approximately 150 K.



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Denna post skapades 2013-08-09. Senast ändrad 2014-09-02.
CPL Pubid: 180960

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Material- och ytteori (1900-2015)

Ämnesområden

Materialvetenskap
Den kondenserade materiens fysik
Halvledarfysik
Elektronstruktur
Defekter och diffusion
Beräkningsfysik

Chalmers infrastruktur