Optimization of silicon solar cell emitters for maximum cell efficiency

The optimum efficiency of n/sup +/p silicon solar cells is determined, taking into account the different factors affecting the photogenerated current, open-circuit voltage, and fill factor. Saturation currents and photogenerated currents are calculated for cells with a Gaussian emitter doping profile. Geometrical and resistive factors are linked to the electrical data, and an optimum design for the front side contact is obtained. Contours of constant optimum efficiency are given. These contours represent a practical tool for determining the optimum efficiency resulting from a particular technology or designing the best technology for a predetermined value of efficiency.<
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