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Interaction of Water with Atomic Layer Deposited Titanium Dioxide on p‐Si Photocathode: Modeling of Photoelectrochemical Interfaces in Ultrahigh Vacuum with Cryo‐Photoelectron Spectroscopy

Cottre, Thorsten ; Fingerle, Mathias ; Kranz, Melanie ; Mayer, Thomas ; Kaiser, Bernhard ; Jaegermann, Wolfram (2024)
Interaction of Water with Atomic Layer Deposited Titanium Dioxide on p‐Si Photocathode: Modeling of Photoelectrochemical Interfaces in Ultrahigh Vacuum with Cryo‐Photoelectron Spectroscopy.
In: Advanced Materials Interfaces, 2021, 8 (11)
doi: 10.26083/tuprints-00020141
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Interaction of Water with Atomic Layer Deposited Titanium Dioxide on p‐Si Photocathode: Modeling of Photoelectrochemical Interfaces in Ultrahigh Vacuum with Cryo‐Photoelectron Spectroscopy
Language: English
Date: 13 February 2024
Place of Publication: Darmstadt
Year of primary publication: 2021
Place of primary publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Materials Interfaces
Volume of the journal: 8
Issue Number: 11
Collation: 11 Seiten
DOI: 10.26083/tuprints-00020141
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

This study combines cryo‐photoelectron spectroscopy and electrochemical analysis techniques to investigate the p‐Si/SiO₂/TiO₂/H₂O system in the context of water‐splitting. Atomic layer deposition is used for the preparation of a TiO₂ thin film coating for a p‐Si/SiO₂ photocathode. First, an interface experiment is performed to study the contact properties of the interface between p‐Si/SiO₂ and TiO₂. For the p‐Si/TiO₂ heterojunction, a downward band bending of 0.3 eV is found for the p‐Si toward the interface. Second, a water adsorption experiment is conducted, which allows the investigation of the surface chemistry of the TiO₂ coating in contact to water. A direct correlation between the amount of surface hydroxide species, formed due to water dissociation, and Ti³⁺ defect state density is found. Furthermore, a surface water species can be identified in addition to the commonly found bulk molecular water. Together with the results from a Mott–Schottky analysis, a complete energy level alignment can be constructed.

Uncontrolled Keywords: atomic layer deposition, energy band diagrams, photoelectron spectroscopy, water adsorption
Identification Number: Artikel-ID: 2002257
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-201410
Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 660 Chemical engineering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 13 Feb 2024 10:36
Last Modified: 21 Jun 2024 07:24
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20141
PPN: 519282094
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