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Metal-Semiconductor Junctions01:24

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Updated: Apr 21, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Atomically engineered metal-insulator transition at the TiO2/LaAlO3 heterointerface.

Makoto Minohara1, Takashi Tachikawa, Yasuo Nakanishi

  • 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.

Nano Letters
|October 25, 2014
PubMed
Summary

Altering atomic boundary conditions of oxides dramatically changes material properties. Modifying the LaAlO3 substrate surface termination transformed insulating titanium dioxide films into a highly conductive, transparent metallic state.

Keywords:
Anatase TiO2heterointerfacesmetal−insulator transitiontermination layer switching

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Surface Science

Background:

  • Atomic boundary conditions significantly influence material properties.
  • Controlling interfacial effects is key to tuning electronic states in oxides.

Purpose of the Study:

  • To investigate the impact of substrate surface termination on the electronic properties of titanium dioxide (TiO2) films.
  • To demonstrate the potential of atomic-level engineering for achieving novel material functionalities.

Main Methods:

  • Epitaxial growth of anatase TiO2 films on LaAlO3 (001) substrates.
  • Controlled variation of the LaAlO3 substrate surface termination (AlO2 vs. LaO).
  • Measurement of room-temperature sheet conductance and optical transparency.

Main Results:

  • A change in substrate termination from AlO2 to LaO resulted in a >3 orders of magnitude increase in sheet conductance.
  • The transition from an insulating to a metallic state was observed in TiO2 films.
  • High optical transparency was maintained across the observed states.

Conclusions:

  • Atomic boundary conditions are a powerful tool for controlling the electronic phase of binary oxides.
  • Tailoring substrate termination offers a pathway to engineer highly conductive and transparent oxide materials.
  • This approach enables the development of advanced electronic and optoelectronic devices.