The diffusion profiles of the front floating emitter (FFE) and front surface field (FSF) in a bifacial interdigitated back contact solar cell are optimized. The optimization results revealed that the FFE and FSF schemes are beneficial for enhancing the cell performance at the front and rear sides, respectively. Lighter doping is particularly better for the FSF scheme, and the FFE scheme requires a large diffusion depth for improving the performance. Increasing the area of the rear emitter boosts the performance of the cell, and an FFE scheme with 90$\%$ rear emitter area is found to be the best design. Quantum efficiency mapping demonstrated that the FFE scheme suppresses the loss at the back surface field region, thereby enhancing the performance of the total cell. The FSF scheme improves the quantum efficiency for the entire region by enhancing the carrier transport in the vertical direction. Furthermore, loss analysis revealed that the FFE scheme suppresses the recombination loss at the maximum power point, which is an important advantage over the FSF scheme.

中文翻译：

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双面叉指背接触太阳能电池前扩散剖面的优化

优化了双面叉指背接触太阳能电池中前浮动发射极 (FFE) 和前表面场 (FSF) 的扩散分布。优化结果表明，FFE 和 FSF 方案分别有利于提高正面和背面的电池性能。较轻的掺杂对于 FSF 方案尤其好，而 FFE 方案需要较大的扩散深度来提高性能。增加后发射器的面积可以提高电池的性能，并且发现具有 90$\%$ 后发射器面积的 FFE 方案是最好的设计。量子效率映射表明 FFE 方案抑制了背面场区的损耗，从而提高了整个电池的性能。FSF 方案通过增强垂直方向的载流子传输来提高整个区域的量子效率。此外，损耗分析表明，FFE 方案抑制了最大功率点的复合损耗，这是优于 FSF 方案的重要优势。