Nanosecond light induced, thermally tunable transient dual absorption bands in a-Ge₅As₃₀Se₆₅ thin film.

Abstract:

:In this article, we report the first observation of nanosecond laser induced transient dual absorption bands, one in the bandgap (TA₁) and another in the sub-bandgap (TA₂) regions of a-Ge₅As₃₀Se₆₅ thin films. Strikingly, these bands are thermally tunable and exhibit a unique contrasting characteristic: the magnitude of TA₁ decreases while that of TA₂ increases with increasing temperature. Further, the decay kinetics of these bands is strongly influenced by the temperature, which signifies a strong temperature dependent exciton recombination mechanism. The induced absorption shows quadratic and the decay time constant shows linear dependence on the laser beam fluence.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Khan P,Saxena T,Jain H,Adarsh KV

doi

10.1038/srep06573

subject

Has Abstract

pub_date

2014-10-10 00:00:00

pages

6573

issn

2045-2322

pii

srep06573

journal_volume

4

pub_type

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