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Title: Electrical and optical properties of Mn-doped Hg{sub 3}In{sub 2}Te{sub 6} crystals

The effect of Mn impurities on the properties of Hg{sub 3}In{sub 2}Te{sub 6} crystals is studied by electrical and optical measurements. It is shown that, despite the high dopant concentration (1 Multiplication-Sign 10{sup 19} cm{sup -3}), the electron concentration remains the same as that in an undoped crystal ({approx}10{sup 13} cm{sup -3} at 300 K). At the same time, narrowing of the band gap from 0.74 to 0.7 eV is observed. From an analysis of the absorption spectra, it is found that the absorption edge is formed by optical transitions involving density-of-states (DoS) tails and that two acceptor- and donor-type impurity bands are formed in the band gap. The two bands are described by a Gaussian distribution of the DoS, with an energy gap between the peaks of E{sub 0} = E{sub d}{sup 0} - E{sub a}{sup 0} = 0.4 eV. The total donor and acceptor concentration N{sub d} + N{sub a} and the degree of compensation K = N{sub a}/N{sub d} {yields} 1 are determined. Such compensation is responsible for pinning of the Fermi level near the middle of the band gap and for quasi-intrinsic conductivity at temperatures T {>=} 300 K.
Authors:
; ; ; ;  [1]
  1. Chernivtsi State University (Ukraine)
Publication Date:
OSTI Identifier:
22210551
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 47; Journal Issue: 9; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ABSORPTION SPECTRA; CRYSTALS; DENSITY; DOPED MATERIALS; FERMI LEVEL; GAUSS FUNCTION; IMPURITIES; OPTICAL PROPERTIES