Electrical, Photoelectrochemical, and Photoelectron Spectroscopic Investigation of the Interfacial Transport and Energetics of Amorphous TiO2/Si Heterojunctions

Shu Hu, Matthias H. Richter, Michael F. Lichterman, Joseph Beardslee, Thomas Mayer, Bruce S. Brunschwig, Nathan S Lewis

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Solid-state electrical, photoelectrochemical, and photoelectron spectroscopic techniques have been used to characterize the behavior and electronic structure of interfaces between n-Si, n+-Si, or p+-Si surfaces and amorphous coatings of TiO2 formed using atomic-layer deposition. Photoelectrochemical measurements of n-Si/TiO2/Ni interfaces in contact with a series of one-electron, electrochemically reversible redox systems indicated that the n-Si/TiO2/Ni structure acted as a buried junction whose photovoltage was independent of the formal potential of the contacting electrolyte. Solid-state current-voltage analysis indicated that the built-in voltage of the n-Si/TiO2 heterojunction was 0.7 V, with an effective Richardson constant 1/100th of the value of typical Si/metal Schottky barriers. X-ray photoelectron spectroscopic data allowed formulation of energy band-diagrams for the n-Si/TiO2, n+-Si/TiO2, and p+-Si/TiO2 interfaces. The XPS data were consistent with the rectifying behavior observed for amorphous TiO2 interfaces with n-Si and n+-Si surfaces and with an ohmic contact at the interface between amorphous TiO2 and p+-Si.

Original languageEnglish
Pages (from-to)3117-3129
Number of pages13
JournalJournal of Physical Chemistry C
Volume120
Issue number6
DOIs
Publication statusPublished - Feb 18 2016

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Photoelectrons
Heterojunctions
heterojunctions
photoelectrons
Atomic layer deposition
Ohmic contacts
Electric potential
Band structure
Electrolytes
Electronic structure
solid state
X ray photoelectron spectroscopy
Metals
photovoltages
electric potential
X rays
Coatings
atomic layer epitaxy
Electrons
energy bands

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Electrical, Photoelectrochemical, and Photoelectron Spectroscopic Investigation of the Interfacial Transport and Energetics of Amorphous TiO2/Si Heterojunctions. / Hu, Shu; Richter, Matthias H.; Lichterman, Michael F.; Beardslee, Joseph; Mayer, Thomas; Brunschwig, Bruce S.; Lewis, Nathan S.

In: Journal of Physical Chemistry C, Vol. 120, No. 6, 18.02.2016, p. 3117-3129.

Research output: Contribution to journalArticle

Hu, Shu ; Richter, Matthias H. ; Lichterman, Michael F. ; Beardslee, Joseph ; Mayer, Thomas ; Brunschwig, Bruce S. ; Lewis, Nathan S. / Electrical, Photoelectrochemical, and Photoelectron Spectroscopic Investigation of the Interfacial Transport and Energetics of Amorphous TiO2/Si Heterojunctions. In: Journal of Physical Chemistry C. 2016 ; Vol. 120, No. 6. pp. 3117-3129.
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