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Recombination Processes at Temperatures Lower than 20 K in Hg 0.8 Cd 0.2 Te
Author(s) -
Calas J.,
Allèggre J.
Publication year - 1982
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221120120
Subject(s) - photoconductivity , recombination , auger , ingot , auger effect , atomic physics , analytical chemistry (journal) , chemistry , bromine , materials science , physics , optoelectronics , metallurgy , biochemistry , alloy , chromatography , gene
Measurements of photoconductivity lifetime τ in the range 2 to 20 K are reported for Hg 0.8 Cd 0.2 Te. A strong increase of this parameter (from 10 to 800 μs) is observed. This effect is attributed to Auger band‐to‐band recombination according to Gerhardts' theory. Another sample of the same ingot, after a long time bromine etching, shows a rapid decrease of the photoconductivity signal (τ ≈ 30 μs) at 2 K which agrees well with the three bands of Casselman's theory of Auger recombination processes. These results prove the existence of an inversion n‐type layer around the p‐type bulk in the annealed samples, according to Scott and Hager's hypothesis.