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Advanced concepts of industrial technologies of crystalline silicon solar cells

100%

Szlufcik J. , Duerinckx F. , Horzel J. , Van Kerschaver E. , Einhaus R. , De Clercq K. , Dekkers H. , Nijs J.

tom Vol. 8, No. 4

299-306

This paper reports on the results of several years of investigations aiming at simplification and efficiency improvement of a low cost screen printing solar cell process. All solar cell process operations, materials and equipment have been, with this respect, critically examined, re - optimised and, if necessary, removed or replaced. A simple industrial type process for high efficiency multicrystalline and monocrystalline solar cells has been developed. The process sequence is based on screen printed contacts fired through a PECVD SiNx antireflection coating layer. The total number of processing steps has been reduced to six. All processing steps can be easily transferred into big volume roduction lines. Solar cells with average cell efficiency above 15% and 17% were respectively obtained on large area multicrystalline and monocrystalline substrates. Including in the processing sequence the advanced processes of isotropic texturisation and selective emitter increases the cell efficiency to 16.9% and 17.9% respectively for multi- and and monocrystalline silicon. A new cell concept, metallisation wrap through cell (MWT), has been recently introduced. The cell efficiency of 13.1% has been obtained in a simple cell processing sequence based on screen printed contacts.