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<p>The preparation route of silver particles is crucial for meeting the requirements of silver electronic pastes for solar cells. However, no systematic comparative studies on the growth-shaped silver particles and aggregation-type silver particles used for silver electronic pastes have been reported, especially in terms of sintering behavior and performance differences. In this study, the direct comparison of two growth mechanisms under controlled conditions is presented. The liquid-phase reduction method was employed to prepare silver particles using silver nitrate as the silver source, ascorbic acid as the reducing agent, and citric acid and polyvinylpyrrolidone as dispersants and morphology control agents to yield two types of silver particles with controllable particle size and good dispersion (aggregated-type silver particles and grown-type silver particles). The structural characteristics and sintering behaviors of both types of silver particles were investigated by various analytical methods, including scanning electron microscopy (SEM) and four-probe sheet resistance testing. The effects of solution pH, silver nitrate concentration, and reaction time on their growth and morphologies were examined. The results showed that silver particles with the same particle size but different surfaces can be formed under altered reaction conditions. After sintering, the grown silver particles exhibited superior sintering activity compared to the aggregated silver particles. The resistivities of the silver pastes based on both types of silver particles after sintering reached only 2.91 × 10⁻⁸ Ω·m and 3.12 × 10⁻⁸Ω·m, respectively. Overall, the low resistivity of these types of silver pastes has great significance for future implementation in high-performance photovoltaic cells.</p>

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Synthesis and sintering properties of growth-type and aggregation-type photovoltaic silver particles with low resistivity

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Ruixi Wan,
  • Guoyou Gan,
  • Xianglei Yu,
  • Xianjie Tang,
  • Junpeng Li,
  • Xiangqian Liao,
  • Tao Yang,
  • Donghui Wang

摘要

The preparation route of silver particles is crucial for meeting the requirements of silver electronic pastes for solar cells. However, no systematic comparative studies on the growth-shaped silver particles and aggregation-type silver particles used for silver electronic pastes have been reported, especially in terms of sintering behavior and performance differences. In this study, the direct comparison of two growth mechanisms under controlled conditions is presented. The liquid-phase reduction method was employed to prepare silver particles using silver nitrate as the silver source, ascorbic acid as the reducing agent, and citric acid and polyvinylpyrrolidone as dispersants and morphology control agents to yield two types of silver particles with controllable particle size and good dispersion (aggregated-type silver particles and grown-type silver particles). The structural characteristics and sintering behaviors of both types of silver particles were investigated by various analytical methods, including scanning electron microscopy (SEM) and four-probe sheet resistance testing. The effects of solution pH, silver nitrate concentration, and reaction time on their growth and morphologies were examined. The results showed that silver particles with the same particle size but different surfaces can be formed under altered reaction conditions. After sintering, the grown silver particles exhibited superior sintering activity compared to the aggregated silver particles. The resistivities of the silver pastes based on both types of silver particles after sintering reached only 2.91 × 10⁻⁸ Ω·m and 3.12 × 10⁻⁸Ω·m, respectively. Overall, the low resistivity of these types of silver pastes has great significance for future implementation in high-performance photovoltaic cells.