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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. (Publisher's Version)
In: Advanced Materials, 34 (32), Wiley, e-ISSN 1521-4095,
DOI: 10.26083/tuprints-00023232,

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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Enhanced Photoconductivity at Dislocations in SrTiO₃
Language: English

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.

Journal or Publication Title: Advanced Materials
Volume of the journal: 34
Issue Number: 32
Place of Publication: Darmstadt
Publisher: Wiley
Collation: 9 Seiten
Uncontrolled Keywords: conductive atomic force microscope, dislocations, microelectrodes, oxide ceramic single crystals, photoconductivity, photovoltaic effect
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
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
DOI: 10.26083/tuprints-00023232
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-232323
Identification Number: 2203032
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23232
PPN: 507934431
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