Abstract
A new approach to the design of the front metal grid in standard photovoltaic solar cells is presented which allows the synthesis of the optimal grid profile for an arbitrary cell geometry. An expression for the total power loss is derived taking into account ohmic losses in the metal grid, losses in the front diffused layer of the cell and losses due to grid shadowing. The loss is minimized by a variational method solving the differential Euler equation and the optimal grid profile is obtained; then the expression for the minimum total power loss is derived. Applications to rectangular and circular solar cells are presented.
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