In the field of nanoscience, silver particles are subjected to a number of industries because of their properties on antibacterial, catalytic, electronic and optical materials. The research on silver nano-particles has also rapidly developed in the past 10 years. With the help of methods like chemical reduction or micro-emulsion, it has become possible to prepare conductive metal nanoparticles which can be applied for metal paste as well. Most commonly, a thick film type of silver paste comprises a functional phase, further consisting of various shapes (spherical, say for example) and different sizes (nanometer, micrometer etc).
A homogenous silver paste is a rather stable system, wherein all components are soluble in the solvent and no particle or solid phase is excluded. The paste is able to avoid the agglomeration of particles, applied in traditional paste types, while eliminating the constraints of particle pattern and size. In recent years, the silver printing circuit board is known to have a structure in which the conducting silver paste goes under screen printing on a PET film for formation of circuits. Silver paste for the purpose of screen printing for circuit formation utilises silver in conductive particles.
Although, one disadvantage associated with ion migration is that it can occur easily. This can however, be handled with a greater amount of ease, since it is highly resistant as compared to copper, which has a specific resistance level, and hence the wide usage of the material. Polymer type conductive paste finds another set of applications. The silver conductive particles come in contact with each other, ensuring a greater electrical conductance. However, with this conductive mechanism, there is contact resistance that occurs between the conductive particles. Silver paste utilised in the ceramics substrate is again composed of glass frit and conductive silver particles. As one of its important applications, silver paste plays an important role in dye sensitized solar cells, which has been attracting a high number of audience and attention to become the next generation of solar cells.
Some important benefits of silver paste includes:
1.High electrical conductivity
2.Lower temperatures for sintering
3.Availability of fine line systems for printing
4.Excellent stability of shelf life
5.Prolonged screen residence times
6.Suitability for usage with a majority of plastics
8.Customized paste systems
Our services at Dynotech Instruments and technology pushes the processing capabilities of a number of industries in India beyond their present possibilities that is helping overcome the hurdles in the way of solar industry empowerment.