Research

Quaternary semiconductors with positive crystal field splitting: Potential high-efficiency spin-polarized electron sources


Reference:

Chen, S. Y., Yin, W. J., Yang, J. H., Gong, X. G., Walsh, A. and Wei, S. H., 2009. Quaternary semiconductors with positive crystal field splitting: Potential high-efficiency spin-polarized electron sources. Applied Physics Letters, 95 (5), 052102.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

http://dx.doi.org/10.1063/1.3193662

Abstract

Traditional high efficiency spin-polarized electron sources (SPES) consist mainly of binary or pseudobinary zinc-blende GaAs based materials, whereas their ternary analogs II-IV-V(2) (II=Zn, Cd, IV=Si, Ge, Sn, and V=As) as well as II-VI ternary analogs I-III-VI(2) (I=Cu, Ag, III=Al, Ga, In, and VI=Se) have not drawn wide attention because their crystal field splitting Delta(CF) near the valence band maximum is either negative or close to zero in their ground state chalcopyrite structure. Using first-principles calculations, we show that some derivative quaternary I-III-II(2)-VI(4) and II-IV-III(2)-V(4) compounds can have coherent ground state stannite or kesterite structures with large and positive Delta(CF) due to their increased chemical and structural flexibility. We propose that ZnSiAl(2)As(4) and CdGeAl(2)As(4) in the stannite structure, and ZnSnGa(2)As(4) and CuAlCd(2)Se(4) in the kesterite structure could be good candidate SPES materials with high polarization and quantum efficiency.

Details

Item Type Articles
CreatorsChen, S. Y., Yin, W. J., Yang, J. H., Gong, X. G., Walsh, A. and Wei, S. H.
DOI10.1063/1.3193662
Uncontrolled Keywordsaluminium compounds, valence bands, compounds, germanium compounds, ground states, strain, copper, space groups, gallium arsenide, ii-vi, ab initio calculations, zinc compounds, electron spin polarisation, tin compounds, silicon compounds, semiconductors, ternary semiconductors, alloys, cadmium compounds, photoemission, crystal field interactions
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code23993

Export

Actions (login required)

View Item