Photoinduced changes in the Urbach tail in Ge‐ and As‐based chalcogenide glasses

1983 ◽  
Vol 54 (2) ◽  
pp. 1048-1052 ◽  
Author(s):  
K. Solomon Harshavardhan ◽  
S. Rajagopalan ◽  
L. K. Malhotra ◽  
K. L. Chopra
Keyword(s):  
Chalcogenide Glasses ◽  
Urbach Tail ◽  
Photoinduced Changes

Photoinduced changes in optical and contact properties of chalcogenide glasses

2001 ◽  
Vol 90 (6) ◽  
pp. 884-886 ◽  
Author(s):  
G. A. Bordovskiĭ ◽  
R. A. Kastro
Keyword(s):  
Chalcogenide Glasses ◽  
Photoinduced Changes

Photostructural change in the Urbach tail in chalcogenide glasses

1980 ◽  
Vol 51 (3) ◽  
pp. 1773-1779 ◽  
Author(s):  
Yasushi Utsugi ◽  
Yoshihiko Mizushima
Keyword(s):  
Chalcogenide Glasses ◽  
Urbach Tail

In Situ EXAFS Study of the Photoexcited State and Defects in Chalcogenide Glasses

MRS Bulletin ◽  
1999 ◽  
Vol 24 (1) ◽  
pp. 32-35 ◽  
Author(s):  
Alexander V. Kolobov ◽  
Hiroyuki Oyanagi ◽  
Kazunobu Tanaka
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Optical Absorption ◽  
Chalcogenide Glasses ◽  
Group Iv Semiconductors ◽  
Photoelectric Properties ◽  
Initial Stage ◽  
Good Review ◽  
Photoinduced Changes

Amorphous chalcogenides, of which selenium is the simplest representative, exhibit a number of unique properties such as the ability to undergo various transformations under the action of the bandgap light. On illumination, the absorption edge shifts to lower energies, and subsequent annealing near the glass-transition temperature leads to a recovery of the initial parameters as demonstrated in Figure 1. Such a photo-induced change could not be observed either in amorphous group IV semiconductors or a-As or in crystalline chalcogenides. A good review of the initial stage of these studies was made by de Neufville.Reversible photodarkening can also be observed in pure chalcogens, but this process can be achieved only at lower temperatures, which is understandable if one takes into account that the glass-transition temperature of selenium is just above room temperature. This result indicates that there is a correlation between the temperature at which photodarkening is annealed out and the flexibility of the glassy network.Reversible changes in the optical absorption are accompanied by (reversible) changes in electrical and photoelectric properties, volume, microhardness, glass-transition temperature, and dissolution rate in various solvents, to name a few. The totality of these changes has led investigators to the conclusion that the photoinduced changes in optical absorption are caused by changes in structure.

Photoinduced changes in the Urbach tail in obliquely deposited amorphous Se(S)1−xGex and As-Se(S)-Ge films

1982 ◽  
Vol 90 (2) ◽  
pp. 170 ◽  
Author(s):  
S. Rajagopalan ◽  
K.Solomon Harshavardhan ◽  
L.K. Malhotra ◽  
K.L. Chopra
Keyword(s):  
Urbach Tail ◽  
Photoinduced Changes

scholarly journals Structural Origin of the Midgap Electronic States and the Urbach Tail in Pnictogen-Chalcogenide Glasses

2018 ◽  
Vol 122 (33) ◽  
pp. 8082-8097 ◽  
Author(s):  
Alexey Lukyanov ◽  
Jon C. Golden ◽  
Vassiliy Lubchenko
Keyword(s):  
Chalcogenide Glasses ◽  
Electronic States ◽  
Urbach Tail

Light-Induced Structural Relaxation and the Photoplastic Effect in Chalcogenide Glasses

2006 ◽  
Vol 115 ◽  
pp. 245-250 ◽  
Author(s):  
M.L. Trunov ◽  
Sergey N. Dub ◽  
R.S. Shmegera
Keyword(s):  
Mechanical Properties ◽  
Flow Stress ◽  
Structural Relaxation ◽  
Chalcogenide Glasses ◽  
Light Illumination ◽  
Depth Sensing ◽  
Static Mechanical ◽  
Photoplastic Effect ◽  
Photoinduced Changes ◽  
Static Mechanical Properties

The combination of depth-sensing indentation and band-gap illumination has been used to study the photoplastic effect (the reversible influence of light on the flow stress, hardness, and plasticity) in chalcogenide glasses on a nanoscale. The prominent photoplasticity of thin As-Se films has been revealed through deviations in the shape of load-displacement curves during nanoindentation under light illumination from those ones which have been observed for the material in the darkness. The photoinduced changes in static mechanical properties such as nanohardness and elastic (Young’s) modulus have been determined. The highest photoplasticity changes are achieved for As20Se80 films while their photodarkening is the lowest.

Photoinduced changes of the rate of dissolution of bilayer films of chalcogenide glasses

2012 ◽  
Vol 38 (2) ◽  
pp. 185-189
Author(s):  
A. V. Belykh ◽  
S. Yu. Kaputkina ◽  
M. D. Mikhailov ◽  
A. S. Tverjanovich
Keyword(s):  
Chalcogenide Glasses ◽  
Bilayer Films ◽  
Rate Of Dissolution ◽  
Photoinduced Changes
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