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Enhanced Photoconductivity at Dislocations in SrTiO₃

Kissel, Maximilian ; Porz, Lukas ; Frömling, Till ; Nakamura, Atsutomo ; Rödel, Jürgen ; Alexe, Marin (2023)
Enhanced Photoconductivity at Dislocations in SrTiO₃.
In: Advanced Materials, 2022, 34 (32)
doi: 10.26083/tuprints-00023232
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Enhanced Photoconductivity at Dislocations in SrTiO₃
Language: English
Date: 2023
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: Wiley
Journal or Publication Title: Advanced Materials
Volume of the journal: 34
Issue Number: 32
Collation: 9 Seiten
DOI: 10.26083/tuprints-00023232
Corresponding Links:
Origin: Secondary publication service

Dislocations are 1D crystallographic line defects and are usually seen as detrimental to the functional properties of classic semiconductors. It is shown here that this not necessarily accounts for oxide semiconductors in which dislocations are capable of boosting the photoconductivity. Strontium titanate single crystals are controllably deformed to generate a high density of ordered dislocations of two slip systems possessing different mesoscopic arrangements. For both slip systems, nanoscale conductive atomic force microscope investigations reveal a strong enhancement of the photoconductivity around the dislocation cores. Macroscopic in-plane measurements indicate that the two dislocation systems result in different global photoconductivity behavior despite the similar local enhancement. Depending on the arrangement, the global photoresponse can be increased by orders of magnitude. Additionally, indications for a bulk photovoltaic effect enabled by dislocation-surrounding strain fields are observed for the first time. This proves that dislocations in oxide semiconductors can be of large interest for tailoring photoelectric functionalities. Direct evidence that electronic transport is confined to the dislocation core points to a new emerging research field.

Uncontrolled Keywords: conductive atomic force microscope, dislocations, microelectrodes, oxide ceramic single crystals, photoconductivity, photovoltaic effect
Identification Number: 2203032
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-232323
Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 15 Feb 2023 13:17
Last Modified: 25 May 2023 06:19
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23232
PPN: 507934431
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