In this paper, we investigate interdigitated back contact solar cells with the front floating\nemitter structure systematically by using simulated and experimental methods. By comparing the\nfront floating emitter structure with the front surface field structure, it is found that the efficiency of\nsolar cells with the front surface field structure quickly reduces with the increasing of back surface\nfield width; while solar cells with the front floating emitter structure can have a wider front surface\nfield width range with minimum impact on the cell efficiency. More importantly, solar cells with\nthe front floating emitter structure have a larger fabrication process tolerance, especially for the\nback surface field width, emitter width, and the bulk resistivity, which means that the fabrication\nprocess flow can be simplified and the production cost can be reduced. Based on the above results,\nlarge area (156.75 mm Ã?â?? 156.75 mm) interdigitated back contact solar cells with the front floating\nemitter structure are fabricated by using the simplified process with only one masking step. SiOx:B\nis used as the passivation layer, which can lead to a higher open circuit voltage and lower surface\nsaturation current density. Finally, an efficiency of 20.39% is achieved for the large area solar cells.
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