The dynamics of photoinduced defect creation in amorphous chalcogenides: The origin of the stretched exponential function

The article discusses the dynamics of photoinduced defect creations (PDC) in amorphous chalcogenides, which is described by the stretched exponential function (SEF), while the well known photodarkening (PD) and photoinduced volume expansion (PVE) are governed only by the exponential function. It is...

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Bibliographic Details
Published in:Journal of applied physics 2014-01, Vol.115 (1)
Main Authors: Freitas, R. J., Shimakawa, K., Wagner, T.
Format: Article
Language:English
Subjects:
AMORPHOUS STATE
Applied physics
CHALCOGENIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL DEFECTS
Exponential functions
IRRADIATION
Photodarkening
PHOTONS
Probability distribution functions
Thermal energy
THERMAL EXPANSION
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Summary:The article discusses the dynamics of photoinduced defect creations (PDC) in amorphous chalcogenides, which is described by the stretched exponential function (SEF), while the well known photodarkening (PD) and photoinduced volume expansion (PVE) are governed only by the exponential function. It is shown that the exponential distribution of the thermal activation barrier produces the SEF in PDC, suggesting that thermal energy, as well as photon energy, is incorporated in PDC mechanisms. The differences in dynamics among three major photoinduced effects (PD, PVE, and PDC) in amorphous chalcogenides are now well understood.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4861143