K. Sedeek et al., OPTICAL-PROPERTIES OF AMORPHOUS-CHALCOGENIDE THIN-FILMS - THE EFFECT OF TE ISOVALENCE SUBSTITUTION IN THE GE-S-SE SYSTEM, Journal of physics. D, Applied physics, 27(1), 1994, pp. 156-159
Optical properties have been studied in amorphous thin films of variou
s Ge-based chalcogenide glasses with a view to investigating the effec
t of Te isovalence substitution in the Ge-S-Se system. Te either compl
etely replaces S to give Ge2.5Te2.5Se95 and Ge5Te5Se90 or partially re
places Se to give Ge2.5S2.5Te2.5Se92.5 and Ge5S5Te5Se85. The changes r
ecorded for the absorption band edge and for the optical gap width are
discussed in terms of the different physical properties of Te with re
spect to S or Se.