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. [Article]
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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.
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