Electron exchange between tin impurity U{sup –} centers in PbS{sub z}Se{sub 1–z} alloys

Journal Article · Fri Jul 15 00:00:00 EDT 2016 · Semiconductors

DOI:https://doi.org/10.1134/S1063782616070149· OSTI ID:22649748

Marchenko, A. V. ^[1]; Terukov, E. I. ^[2]; Rasnjuk, A. N.; Kiselev, V. S. ^[1]

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1. Alexander Herzen State Pedagogical University of Russia (Russian Federation)
2. Russian Academy of Sciences, Ioffe Physical–Technical Institute (Russian Federation)

Using emission {sup 119mm}Sn({sup 119m}Sn) and {sup 119}Sb({sup 119m}Sn) Mössbauer spectroscopy, it is shown that impurity tin atoms in PbS{sub z}Se{sub 1–z} alloys substitute lead atoms and are two-electron donors with negative correlation energy (U{sup –} centers). It is found that the energy levels related to impurity tin atoms are in the lower half of the band gap at z ≥ 0.5 against the background of allowed valence-band states at z ≤ 0.4. The electron exchange between neutral and doubly ionized tin U{sup –} centers in partially compensated Pb{sub 0.99}Sn{sub 0.005}Na{sub 0.005}S{sub z}Se{sub 1–z} alloys is studied. The activation energy of this process decreases from 0.111(5) eV for a composition with z = 1 to 0.049(5) eV for compositions with c ≤ 0. For all z, the exchange is implemented via the simultaneous transfer of two electrons using delocalized valence-band states.

• OSTI ID: 22649748
• Journal Information: Semiconductors, Vol. 50, Issue 7; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ACTIVATION ENERGY
ANTIMONY 119
BINDING ENERGY
CONCENTRATION RATIO
ELECTRON CORRELATION
ELECTRON EXCHANGE
ELECTRONS
ENERGY GAP
ENERGY LEVELS
LEAD SELENIDES
LEAD SULFIDES
MOESSBAUER EFFECT
TIN
TIN 119
U CENTERS
VALENCE