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Massive dipoles across the metal-semiconductor cluster interface: towards chemically controlled rectification.

Dinesh Bista1, Turbasu Sengupta, Shiv N Khanna

  • 1Department of Physics, Virginia Commonwealth University, Richmond, VA 23284-2000, USA. Snkhanna@vcu.edu.

Physical Chemistry Chemical Physics : PCCP
|October 6, 2021
PubMed
Summary

A new metal-semiconductor interface formed by MgAl12 and Re6Se8(PMe3)5 clusters creates a Schottky barrier. This composite cluster acts as a rectifier and shows potential for photovoltaic applications due to efficient electron-hole separation.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Metal-semiconductor interfaces are crucial for electronic devices, often exhibiting Schottky barriers.
  • Superatomic clusters offer tunable electronic properties for novel interface engineering.
  • Understanding charge transfer and dipole formation at cluster interfaces is key to device design.

Purpose of the Study:

  • To investigate the electronic and structural properties of a novel interface between metallic MgAl12 and semiconducting Re6Se8(PMe3)5 clusters.
  • To determine if this composite cluster exhibits characteristics of a Schottky barrier and can function as a rectifier.
  • To explore the potential of this system for photovoltaic applications.

Main Methods:

  • Computational modeling to analyze the electronic structure and charge distribution of the composite cluster.
  • Calculation of key electronic parameters such as electron affinity, ionization energy, dipole moment, HOMO, and LUMO levels.
  • Analysis of the interface dipole and its relation to Schottky barrier formation.

Main Results:

  • A massive dipole moment (28.38 D) was observed at the MgAl12-Re6Se8(PMe3)5 interface due to charge transfer.
  • The interface exhibits a Schottky barrier, with the highest occupied molecular orbital (HOMO) of MgAl12 0.53 eV below the lowest unoccupied molecular orbital (LUMO) of Re6Se8(PMe3)5.
  • A bias voltage of approximately 4.1 V is required to overcome the barrier, and ligand attachment offers chemical control over rectification.
  • The fused cluster demonstrates efficient electron-hole pair separation with minimal recombination.

Conclusions:

  • The MgAl12-Re6Se8(PMe3)5 composite cluster forms a Schottky barrier, enabling rectification behavior.
  • The system shows promise for photovoltaic applications due to its ability to separate charge carriers effectively.
  • This work highlights the potential of designing functional interfaces using superatomic clusters.