device 110 may be in direct contact with one or both of the glass sheets 130 140 if e g the glass sheets 130 140 are utilized as a substrate or superstrate for the pv device 110 or the pv device 110 may incorporate a substrate layer e g a foil of a metal or another conductor or of a polymer such as polyimide below and or above the pv device junctions and in contact with one or both of the glass sheets 130 140 in embodiments in which a substrate layer is disposed above the pv device junctions the u201c substrate u201d is understood to include u201c superstrate u201d configurations as they are known in the art as shown in fig3 a 3d the conductive bus ribbon 120 and glass powder seal 160 may have any of several different configurations for example in the configuration depicted in fig3 a the conductive bus ribbon 120 is in contact with both the upper glass sheet 140 and the lower glass sheet 130 and the glass powder 160 seals the remaining portion of the gap 150 between the glass sheets 130 140 and contacts the bus ribbon 120 in fig3 b and 3c the bus ribbon 120 is in contact with only the lower glass sheet 130 fig3 b or upper glass sheet 140 fig3 c and the glass powder 160 seals the remaining portion of the gap 150 between the glass sheets 130 140 and above or below the bus ribbon 120 in fig3 d the bus ribbon 120 extends through the glass powder seal 160 without contacting either of the glass sheets 130 140 depending upon the compositions of the bus ribbon 120.