Comprehensive study of photoinduced changes kinetics in ternary GeSb-Se chalcogenide thin films

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F22%3A39919345" target="_blank" >RIV/00216275:25310/22:39919345 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1117/12.2624143" target="_blank" >http://dx.doi.org/10.1117/12.2624143</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2624143" target="_blank" >10.1117/12.2624143</a>

Result language

angličtina

Original language name

Comprehensive study of photoinduced changes kinetics in ternary GeSb-Se chalcogenide thin films

Original language description

In this work, the kinetics of photoinduced changes in sputtered ternary Ge29Sb8Se63 chalcogenide thin films with different thicknesses is studied. The optical bandgap energy of virgin thin films is 1.87 +/- 0.02 eV and the refractive index at 1 550 nm is 2.55 +/- 0.01 as determined by spectroscopic ellipsometry using Cody-Lorentz oscillator model. An annealing treatment caused bleaching of thin films resulting in optical bandgap energy increase to 1.96 +/- 0.02 eV accompanied with refractive index decrease down to 2.54 +/- 0.01. Subsequently, the photoinduced shift of the absorption edge was determined by the analysis of transmission data obtained by fibre-coupled high-resolution spectrometer. The irradiation of virgin thin films by near-bandgap light coming from continuous-wave diode-pumped solid-state laser leads to a fast photodarkening (PD) followed by slow photobleaching (PB) effect. The PB effect persists in virgin films and the maximum magnitude of this effect was found in film with the thickness of similar to 350 nm. Rise of the optical bandgap energy was similar to 0.04 +/- 0.02 eV using optical intensity of 125.0 +/- 5.0 mW center dot cm(-2). On the other hand, in annealed thin films, only PD occurs under the same conditions indicating that the PB component of the photoinduced change disappears when the film is annealed. Maximum decrease in optical bandgap energy due to the PD effect in annealed films was about similar to 0.05 +/- 0.02 eV found in film with the thickness of similar to 650 nm. An influence of the thickness and laser optical intensity onto the kinetics of photoinduced changes is discussed.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of SPIE, volume 12151

ISBN

978-1-5106-5178-4

ISSN

0277-786X

e-ISSN

1996-756X

Number of pages

5

Pages from-to

"121510F"

Publisher name

SPIE - The International Society for Optical Engineering

Place of publication

Bellingham

Event location

Strasbourg

Event date

Apr 3, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000838105000014