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Novel front metal contact patterning scheme for C-SI solar cells

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Title Novel front metal contact patterning scheme for C-SI solar cells
 
Creator SASTRY, AP
CHAUDHARY, VA
SOLANKI, CS
 
Subject front contact patterning
solar cell
chemical etching
 
Description An alternative metallization scheme for c-Si solar cells other than Ag screen printing, has gained importance in recent years. Metallization techniques such as two step electroplated contacts of Ni/Cu and Ni/Ag, have shown higher efficiencies in c-Si solar cells. One of the important processes in the electroplated contacts is opening of the dielectric layer (like SiN(x) or SiO(2)). In this paper a novel contact patterning scheme based on use of a thermally sensitive chemical etching paste Merck, Isishape (TM) is presented. Commercially processed c-Si solar cells of area 4 x 4 cm(2) are used in the experiment. These solar cells are processed for texturization, p-n junction formation, antireflective coating (ARC) deposition and back surface field (BSF), but without front metal contacts. A thermally sensitive paste from Merck, Isishape (TM) is used for etching the ARC. A block of stainless steel is micro-machined in order to get extrusion of metal pattern similar to finger and bus bar for the front metal contact. Arrangements for electrical heating of the metal block are made. Using the electrical heaters the metal block can be heated up to 500 degrees C. Using the proposed technique finger lines of width 250 mu m are developed on the ARC coated textured c-Si wafers. The proposed patterning technique can be used in industrial environment with high throughput.
 
Publisher IEEE
 
Date 2011-10-25T07:33:48Z
2011-12-15T09:11:39Z
2011-10-25T07:33:48Z
2011-12-15T09:11:39Z
2010
 
Type Proceedings Paper
 
Identifier 35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE,
978-1-4244-5891-2
0160-8371
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15646
http://hdl.handle.net/100/2207
 
Source 35th IEEE Photovoltaic Specialists Conference,Honolulu, HI,JUN 20-25, 2010
 
Language English