Rapid firing of printed pastes for BSF solar cell under high intensity light source

This paper describes a technique of rapid firing of screen-printed aluminum paste for back surface field (BSF) solar cell under high intensity light source. Excellent antireflection coating and shallow junction were formed at the same time with a phosphoric-titanate compound solution spun over etched P-type silicon surface. An aluminum paste was printed on the rear surface of the cell. A P/sup +/ layer was formed by alloying an aluminum paste under high energy density visible light source. The silicon substrate absorbed light energy from heating lamps efficiently due to the effect of original TiO/sub 2/ anti-reflection coating. As a result, it is possible to fire an aluminum paste effectively in less than 30 seconds because of the high heating rate of the substrate.