Premium
The Effect of Long‐Range Disorder on the Optical Spectra of Tetrahedrally Bonded Semiconductors
Author(s) -
Maschke K.,
Overhof H.,
Thomas P.
Publication year - 1975
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.2220700108
Subject(s) - pseudopotential , condensed matter physics , amorphous semiconductors , semiconductor , spectral line , amorphous solid , range (aeronautics) , relaxation (psychology) , materials science , short range order , tin , conduction band , scattering , chemistry , physics , optics , quantum mechanics , crystallography , optoelectronics , electron , psychology , social psychology , metallurgy , composite material
A comparison is made of the configurational averaged spectral function for amorphous ZnS obtained from a pseudopotential (CPSP) and a muffin‐tin (CKKR) approach using the same scattering correlation function. This function leads to a relaxation only of the long‐ range order in the CKKR scheme whereas for the CPSP scheme short‐range potential fluctuations are also introduced. As a result, the CKKR conduction band states are affected equally by disorder. Only the pseudopotential states exhibit selective changes which are essential in order to obtain agreement with experimental spectra. It is, therefore, concluded that short‐range potential fluctuations are responsible for the difference in ϵ 2 of amorphous and crystalline semiconductors.