The achievement of 20% efficiency in a CZ silicon solar cell under concentration

The laser grooved, buried grid solar cell made in a production facility with silicon CZ wafers had previously demonstrated efficiencies of over 18% at 19/spl times/ concentration. Recent work has succeeded in reducing the cell series resistance and efficiencies of 20.1% (38 cm/sup 2/) at 10 Suns and 19.8% at 20 Suns have been achieved. Efficiency in the best solar cell has been maintained to over 18% at 40/spl times/.< >