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Electrical and Optical Properties of Amorphous and Monoclinic Selenium under Very High Pressure
Author(s) -
Fuhs W.,
Schlotter P.,
Stuke J.
Publication year - 1973
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.2220570215
Subject(s) - monoclinic crystal system , selenium , amorphous solid , absorption edge , trigonal crystal system , electrical resistivity and conductivity , materials science , conductivity , band gap , analytical chemistry (journal) , chalcogen , chemistry , crystallography , crystal structure , metallurgy , optoelectronics , physics , organic chemistry , quantum mechanics
The conductivity of amorphous, monoclinic, and trigonal selenium has been measured at 300°K as a function of quasihydrostatic pressure up to 150 kbar. Amorphous and monoclinic samples after exposure to pressure above 120 kbar are transformed irreversibly to the trigonal modification. This result is confirmed by the direct observation of the corresponding shift of the absorption edge. Besides conductivity, for amorphous selenium the shift of absorption edge with pressure is investigated. The resulting pressure coefficient of the band gap is in good accordance with the value obtained from the pressure dependence of the conductivity with the assumption that intrinsic conduction predominates in amorphous selenium.