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56 SMT007 MAGAZINE I JULY 2022 Article by Narahari Pujari and Krithika PM MACDERMID ALPHA ELECTRONICS SOLUTIONS Introduction e interdigitated back contact (IBC) is one of the methods to achieve rear contact solar cell interconnection. e contact and inter- connection via rear side theoretically achieve higher efficiency by moving all the front con- tact grids to the rear side of the device. is results in all interconnection structures being located behind the cells, which brings two main advantages. First, there is no frontside shading of the cell by the interconnection rib- bons, thus eliminating the need for trading off series resistance, losses for shading losses when using larger interconnection ribbons. Second, a more homogeneous looking front- side of the solar module enhances the aesthet- ics 1 . is combined increased power yield and improved aesthetics make back-contact mod- ules particularly suited for special applications such as vehicle and building integration. Out of many ways of interconnecting the IBC cells, busbar stringing, which is similar to conventional tabbing and stringing of two-side contacted cells, is the most common method 2 . In this technique, the metallization design of the cell contains multiple parallel-printed bus- bars distributed over the cell, allowing shorter finger length, and ribbon on busbar soldering. is reduces the resistance losses in the metal- lization compared to the edge stringing 2 . With the advent in multibar bar (MBB) technol- ogy, the width of these busbars is also reduc- Solder Paste Printing and Optimizations for Interconnecting Back Contact Cells

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