Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K05: Defects and Doping in Oxide Semiconductors
3:00 PM–5:48 PM,
Tuesday, March 5, 2024
Room: L100E
Sponsoring
Units:
DMP DCOMP FIAP
Chair: Filip Tuomisto, University of Helsinki
Abstract: K05.00006 : Oral: Room Temperature Persistent Photoconductivity of KTaO3 single crystals. *
4:00 PM–4:12 PM
Presenter:
Macarena M Santillan
(washington state university)
Authors:
Macarena M Santillan
(washington state university)
Matthew D McCluskey
(Washington State University)
In this work, KTO crystals were annealed in a silica ampoule filled with hydrogen gas and a piece of tantalum wire, creating an oxygen-poor environment and thus oxygen vacancies. IR spectroscopy showed a transmission threshold at 340 nm, free carrier absorption, and a reduction of the hydrogen peaks post-anneal treatment. After exposing the crystals to a 340 nm light-emitting diode (LED), evidence of persistent photoconductivity (PPC) was observed. Hall effect measurements indicate an increase in n-type conductivity of three orders of magnitude that lasts for several weeks. The PPC effect can be reversed by an open-air anneal and re-induced by repeating the irradiation.
*Work supported by NSF grant DMR-2109334
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