Constructal design of top metallic contacts on a disc-shaped solar cell

Trends in crystalline silicon photovoltaic improvements demonstrate that some of the key factors have contributed to reaching efficiency values up 23 % are introduction passivated emitter and rear cell structure with local contacts low-cost large-volume fabrication; reduction width front metallization fingers, from about 100 microm less than 30 micro m large volume production, re-emergence mono-crystalline wafers as a consequence cost Czochralski ingot fabrication process. In present work, we developed theoretical model defines geometric arrangement branched top metallic network over solar disc-shaped body. The considers two main regions: material an insert for collection photogenerated electrical current. characteristics defined minimization resistive power losses applying constructal design method. As fundamental result, optimal lengths, branching angles, geometrical relationships n-branched determined. numerical results show dimensionless minimum allocation disc size cell.