Optimization of gridlines and fingers of solar cells by a new numerical method

The shape of grid lines or fingers, used to reduce conductive losses in photovoltaic cells, is shown to be optimized while the current flux in the line remains constant. This result is derived for cells of arbitrary geometry. There is an analytical way to achieve almost the best pattern, but a necessary assumption forces us to keep the fraction of shaded area small compared to the rest. We found a numerical method to get around the obstacle mentioned above. The algorithm has the ability to analyze 3D cells too. It works like genetic algorithms. The differences and similarities between the results of both methods are shown in conclusion.