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SOLUS 6205

Fritted Aluminum Conductive Paste for PV Applications

Paste Description:  SOLUS 6205 is a fritted, screen printable, aluminum paste designed to provide a uniform back surface field for co-firing. The paste can be printed using a 200-325 mesh screen in a well ventilated area at a temperature of about 25-30 ^oC. Drying of the paste typically takes 2-4 minutes in an IR belt drier at a peak of 200-350 ^oC or about 5 minutes in a circulated air oven. Typical firing range in on the order of 800-950 ^oC depending on the sheet resistivity, type of antireflective coating, the thickness of the substrate, the belt speed, and the agressiveness of the front silver paste.

Technical Advantage: The paste is designed to enhance the Al/Si eutectic interface for a co-firing processing sequence thereby improving the effectiveness of the p⁺ layer. The formulation allows uniform BSF formation which tends to improve the red response of the solar cells. SOLUS 6205 is designed to render low bow after firing on substrates 250um or less without sacrificing performance. There is also penetration of Al/Si intermetallic through the unreacted Al layer during cooling due to its well controlled kinetics. The paste is also designed to exhibit the lamellae appearance of the eutectic layer at the back of the wafer after firing. The shelf life of the paste is in excess of 6 months if capped tightly after each use. SOLUS 6205 can be thinned if needed to adjust the viscosity using Cermet's formulated thinner. Resistivity of the fired paste on a Cz substrate is stable over the recommended firing range.

Cermet always welcomes the opportunity to modify/customize our standard products to meet each customer's unique requirements and processes.

Fig 1: Aluminum Firing Profile

Summary of SOLUS 6205 Properties and Process Recommendations