Influence Factors on the Size of Spherical Silver Powder Used for Solar Cell Top Electrode Paste

Abstract:

The ultra-fine silver powders were prepared by chemical reduction using nitric acid silver (AgNO₃) as raw material, ascorbic acid (C₆H₈O₆) as deoxidizer and adding polyvinylpyrrolidone (PVP) as dispersing agent. The influence factors, such as AgNO₃ solution concentration, ascorbic acid solution concentration, PVP dosage and reaction conditions such as temperature, PH etc. were studied. The morphology and particle size distribution were observed by Field Emission Scanning Electron Microscopy (FSEM) and laser particle analyzer. The composition was analyzed by Energy Dispersive Spectrometer (EDS).The crystal phase was tested by X-ray Diffraction (XRD). It indicates that the spherical ultra-fine silver powder is face-centered cubic structure, its diameter is about 1.0 μm with homogeneous particle size distribution and smooth surface. It was prepared under the conditions as following: dropwise added 60 g/L AgNO₃ solution into 40g/L ascorbic acid solution, with the presence of PVP, and pH=3,45,360rpm. It meets the requirements of paste for solar cells top electrode.

• Periodical: Materials Science Forum (Volumes 743-744)
• Pages: 903-909
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.743-744.903
• Online since: January 2013
• Authors: Si Zhang, Yue Lin Zhu, Jia Song
• Keywords: Particle Size, Silver Paste, Surface Morphology, Ultra-Fine Silver Power

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