The impact of iron concentration on strontium titanate oxide materials as shown through ultrafast dynamics
Schueller, Kailyn Marie
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/129638
Description
Title
The impact of iron concentration on strontium titanate oxide materials as shown through ultrafast dynamics
Author(s)
Schueller, Kailyn Marie
Issue Date
2025-05-07
Director of Research (if dissertation) or Advisor (if thesis)
Vura-Weis, Josh A.
Department of Study
Chemistry
Discipline
Chemistry
Degree Granting Institution
University of Illinois Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
photo-ionics
ultrafast spectroscopy
Abstract
Understanding the ultrafast dynamics of photo-ionic materials such as Sr(Ti1-xFex)O3-x/2+δ
will allow for the development of design principles of future photo-ionic materials. Optical transient absorption on a sub picosecond to few nanosecond timescale was performed on a series
of different iron content in Sr(Ti1-xFex)O3-x/2+δ. Several experimental parameters had to be checked in order to get the most accurate excited state spectra. These included the fluence of the light, the wavelength of excitation, and samples prepared in different ways. After evaluating each
of these conditions, excited state spectra of six samples ranging from an iron content of 4% to 35% were studied with an excitation wavelength of 340 nm and a fluence of 0.7 mJ/cm2. The excited state spectra of the series differs qualitatively between the low vs high iron content. All of the excited state spectra show features from band gap renormalization and free carrier absorption. On the timescale studied in this experiment, longer lived excited states are correlated with lower iron content.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
