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Related Concept Videos

Electrodeposition01:08

Electrodeposition

633
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Formation of Complex Ions03:45

Formation of Complex Ions

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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Related Experiment Video

Updated: Jun 28, 2025

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution

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A High Copper Concentration Copper-Quadrol Complex Electroless Solution for Chip Bonding Applications.

Jeng-Hau Huang1, Po-Shao Shih1, Vengudusamy Renganathan1

  • 1Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan.

Materials (Basel, Switzerland)
|April 13, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new copper plating method for semiconductor chip packaging. This technique speeds up bonding processes, enabling mass production of efficient, high-density interconnections.

Keywords:
3D integrationTaguchi methodcopper–quadrol complex solutionelectroless Cu platinglow-temperature bondingpressure free bonding

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Area of Science:

  • Semiconductor manufacturing
  • Materials science
  • Chemical engineering

Background:

  • Microfluidic electroless interconnections offer potential for low-temperature, low-pressure bonding in chip packaging.
  • Current microfluidic methods are too complex and time-consuming for mass production.

Purpose of the Study:

  • To develop a novel, mass-producible bonding method for semiconductor chip packaging.
  • To enhance efficiency and performance through downsizing high-density and 3D-stacked interconnections.

Main Methods:

  • A tailored plating solution with enhanced copper concentration and plating rate was developed.
  • The Taguchi approach was used to optimize the copper-quadrol complex solution, plating rate, and decomposition time.
  • The process eliminates the need for fluid motion, reducing production time.

Main Results:

  • The optimized solution features over five times the copper concentration of conventional solutions.
  • Achieved a plating rate of 22.2 μm/h and a decomposition time of 8 min on a Cu layer substrate.
  • Successfully bonded copper (Cu) pillars within 7 min at 35 °C with 99% bonding percentage after planarization.
  • Demonstrated a significant fracture strength of 76 MPa via mechanical shear testing.

Conclusions:

  • The proposed plating method is suitable for mass production of semiconductor interconnections.
  • This technique significantly improves bonding efficiency and speed for chip packaging.
  • The method achieves high bonding success rates and mechanical strength for advanced packaging applications.