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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Contact resistivity decrease at a metal/semiconductor interface by a solid-to-liquid phase transitional

Dong-Youn Shin1, Jun-Young Seo, Min Gu Kang

  • 1Department of Graphic Arts Information Engineering, Pukyong National University , 365, Sinseon-ro, Nam-gu, Busan, 608-739, Republic of Korea.

ACS Applied Materials & Interfaces
|September 4, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces silver neodecanoate to significantly lower silver paste contact resistivity at metal/semiconductor interfaces. This innovation ensures stable performance across a wide range of firing temperatures, crucial for silicon solar cells.

Keywords:
contact resistivitymetallo-organic silvernoble-metal-assisted etchingphase transitionsilicon solar cellsilver nanocolloids

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Chemical Engineering

Background:

  • Achieving low contact resistivity in silver paste for metal/semiconductor interfaces is critical for efficient device performance.
  • Conventional silver pastes struggle with stable low resistivity across a broad range of firing temperatures.
  • Passivation layers, such as silicon nitride, pose challenges for effective metal contact formation.

Purpose of the Study:

  • To develop a novel silver paste formulation utilizing silver neodecanoate for enhanced contact resistivity.
  • To investigate the mechanism by which silver neodecanoate improves contact properties at elevated temperatures.
  • To demonstrate the broad applicability of this new paste in silicon solar cell fabrication.

Main Methods:

  • Utilizing solid-to-liquid phase transitional metallo-organic silver (silver neodecanoate) in silver paste formulations.
  • Analyzing the thermal decomposition of silver neodecanoate and its interaction with metal oxide glass frit.
  • Investigating the role of silver nanoclusters and redox reactions in removing passivation layers.
  • Measuring contact resistivity across a range of peak firing temperatures (750–810 °C).

Main Results:

  • Silver neodecanoate facilitates the dissolution of silver nanoclusters into molten glass frit, even at lower temperatures.
  • The presence of silver nanoclusters and O(2-) ions enables noble-metal-assisted etching of silicon nitride passivation layers.
  • Silver paste with silver neodecanoate achieved significantly lower and more stable contact resistivity (4.12–16.08 mΩ cm(2)) compared to conventional paste (2.61–72.38 mΩ cm(2)).
  • Low contact resistivity was maintained over a broad firing temperature range.

Conclusions:

  • Silver neodecanoate is an effective additive for creating silver pastes with consistently low contact resistivity.
  • The mechanism involves enhanced etching of passivation layers and enrichment of silver nanocolloids during cooling.
  • This approach offers greater flexibility in firing temperature selection for silicon solar cell manufacturing.