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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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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Flat-lying semiconductor-insulator interfacial layer in DNTT thin films.

Min-Cherl Jung1, Matthew R Leyden, Gueorgui O Nikiforov

  • 1Energy Materials and Surface Sciences Unit (EMSS), Okinawa Institute of Science and Technology Graduate University (OIST) , 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan.

ACS Applied Materials & Interfaces
|December 30, 2014
PubMed
Summary
This summary is machine-generated.

Researchers discovered a flat-lying molecular layer at the semiconductor-insulator interface in dinaphtho[2,3-b:2

Keywords:
AFMDNTTGIXDNEXAFSvacuum evaporation

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Area of Science:

  • Organic electronics
  • Materials science
  • Semiconductor physics

Background:

  • The molecular arrangement at the organic semiconductor-gate dielectric interface critically impacts charge mobility in thin film transistors.
  • Understanding this buried interface is challenging yet crucial for device performance.

Purpose of the Study:

  • To investigate the molecular ordering of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) at the semiconductor-insulator interface.
  • To correlate charge mobility with crystal grain size and orientation in DNTT thin film transistors.

Main Methods:

  • Fabrication of DNTT thin film transistors using thermal evaporation under vacuum.
  • Systematic variation of substrate temperatures during fabrication.
  • Correlation analysis between extracted charge mobility, crystal grain size, and crystal orientation.

Main Results:

  • Identification of a distinct molecular layer of flat-lying DNTT molecules at the semiconductor-insulator interface.
  • Observation that this interfacial layer may impede charge transport.
  • Potential for this layer to exist in other organic semiconductor systems.

Conclusions:

  • The flat-lying molecular layer at the DNTT-dielectric interface is a significant factor influencing charge transport.
  • Controlling this interfacial layer offers a pathway to enhance the performance of organic thin film devices.
  • Further research into interfacial molecular engineering is warranted for advanced organic electronics.