Band-Gap Nonlinearity in Lead Chalcogenide (PbQ, Q = Te, Se, S) Alloys

AMINORROAYA YAMINI, Sima, PATTERSON, Vaughan and SANTOS, Rafael (2017). Band-Gap Nonlinearity in Lead Chalcogenide (PbQ, Q = Te, Se, S) Alloys. ACS Omega, 2 (7), 3417-3423.

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Official URL: http://pubs.acs.org/doi/full/10.1021/acsomega.7b00...
Link to published version:: 10.1021/acsomega.7b00539

Abstract

Narrow band-gap lead chalcogenides have been developed for several optical and electronic applications. However, band-gap energies of the ternary and quaternary alloys have received little attention compared with the parent binary phases. Here, we have fabricated single-phase ternary (PbTe)1−x(PbSe)x and quaternary (PbTe)0.9−y(PbSe)0.1(PbS)y and (PbTe)0.65−z(PbSe)0.35(PbS)z alloys and shown that although lattice parameters follow Vegard’s law as a function of composition, the bandgap energies exhibit a substantial bowing effect. The ternary (PbTe)1−x(PbSe)x system features a smaller bowing parameter predominantly due to the difference in electronegativity between Se and Te, whereas the larger bowing parameters in quaternary alloys are generated from a larger crystal lattice mismatch and larger miscibility gap. These findings can lead to further advances in tuning the band-gap and lattice parameters for optical and electronic applications of lead chalcogenides.

Item Type: Article
Additional Information: Article published under ACS AuthorChoice license which permits copying and redistribution of the article or any adaptations for non-commercial purposes, (Further license information available via Publisher link below)
Research Institute, Centre or Group: Materials and Engineering Research Institute > Engineering Research
Identification Number: 10.1021/acsomega.7b00539
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Depositing User: Sima Aminorroaya Yamini
Date Deposited: 13 Jul 2017 13:02
Last Modified: 14 Jul 2017 19:48
URI: http://shura.shu.ac.uk/id/eprint/16174

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